
1 

(1) These Regulations may be cited as the Air Quality Limit Values (Scotland) Regulations 2003 and shall come into force on 2nd October 2003.
(2) These Regulations extend to Scotland only.
2 
In these Regulations–
 “agglomeration” means a zone with a population concentration in excess of 250,000 inhabitants, or, where the population concentration is 250,000 inhabitants or less, a population density per km2 for which the Scottish Ministers consider that the need for ambient air to be assessed or managed is justified;
 “alert threshold” has the meaning given in regulation 10(2) and (3);
 “ambient air” means outdoor air in the troposphere, excluding work places;
 “assessment” means any method used to measure, calculate, predict or estimate the level of a relevant pollutant, ozone or ozone precursor substances in the ambient air;
 “fixed measurements” means measurements taken at fixed sites either continuously or by random sampling, the number of measurements being sufficiently large to enable the levels observed to be determined;
 “information threshold” has the meaning given in regulation 10(3);
 “level” means the concentration of a relevant pollutant, ozone or ozone precursor substances in ambient air;
 “limit value” has the meaning given in regulation 4(1);
 “long-term objective” has the meaning given in regulation 5(2);
 “lower assessment threshold” has the meaning given in regulation 7(8);
 “margin of tolerance” means the level of the limit value by which this value may be exceeded subject to the conditions laid down in Schedule 1;
 “natural events” means volcanic eruptions, seismic activities, geothermal activities, wild-land fires, high-wind events or the atmospheric resuspension or transport of natural particles from dry regions;
 “oxides of nitrogen” means the sum of nitric oxide and nitrogen dioxide added as parts per billion and expressed as nitrogen dioxide in microgrammes per cubic metre;
 “ozone precursor substances” means substances which contribute to the formation of ground level ozone, including those listed in Schedule 6;
 “PM2.5” means particulate matter which passes through a size-selective inlet with a 50% efficiency cut-off at 2.5 μm aerodynamic diameter;
 “PM10” means particulate matter which passes through a size-selective inlet with a 50% efficiency cut-off at 10 μm aerodynamic diameter;
 “public” has the meaning given in regulation 14(15);
 “relevant pollutants” means sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter, lead, benzene and carbon MONOXIDE;
 “rural background station” shall be interpreted in accordance with Part II of Schedule 4;
 “target value” has the meaning given in regulation 5(1);
 “transboundary pollution” means ozone concentrations exceeding target values or long term objectives due largely to emissions of ozone precursor substances in other Member States;
 “upper assessment threshold” has the meaning given in regulation 7(8);
 “volatile organic compounds” or “VOC” means all organic compounds from anthropogenic and biogenic sources, other than methane, that are capable of producing photochemical oxidants by reaction with nitrogen oxides in the presence of sunlight; and
 “zone” means a part of the territory of Scotland shown on a map published by the Scottish Executive on 19th January 2001 a copy of which is deposited at the offices of the Scottish Executive, Victoria Quay, Edinburgh, EH6 6QQ and displayed on the Scottish Executive website at www.scotland.gov.uk.
3 
The Scottish Ministers are designated as the competent authority for the purposes of article 3 (implementation and responsibilities) of Council Directive 96/62/EC on ambient air quality assessment and management.
4 

(1) The Scottish Ministers shall take the measures necessary to ensure that in each zone concentrations of relevant pollutants in ambient air, as assessed in accordance with regulations 6 to 9, do not exceed the limit values set out in Schedule 1 from the dates specified in that Schedule.
(2) The measures taken shall–
(a) take into account an integrated approach to the protection of air, water and soil; and
(b) have no significant negative effects on the environment in the other Member States.
5 

(1) The target values for ozone concentrations in ambient air are set out in Part II of Schedule 2.
(2) The long-term objectives for ozone concentrations in ambient air are set out in Part III of Schedule 2.
6 
The Scottish Ministers shall ensure that ambient air quality is assessed in each zone in relation to each of the relevant pollutants, ozone and ozone precursor substances in accordance with regulations 7 to 9.
7 

(1) The Scottish Ministers shall, in accordance with paragraphs (3), (4) and (7), classify each zone in relation to each of the relevant pollutants according to whether ambient air quality in that zone for that pollutant is required to be assessed by–
(a) measurements;
(b) a combination of measurements and modelling techniques; or
(c) by the sole use of modelling or objective estimation techniques.
(2) The Scottish Ministers shall, in accordance with paragraphs (5) and (6), classify each zone in relation to ozone according to whether ambient air quality for ozone is required to be assessed by –
(a) fixed continuous measurement; or
(b) a combination of measurement campaigns of short duration and results from emission inventories and modelling.
(3) Measurements must be used to assess ambient air quality in relation to a relevant pollutant in a zone if–
(a) the zone is an agglomeration;
(b) the levels of that pollutant in the zone are between the relevant limit values and upper assessment thresholds; or
(c) the levels of that pollutant in the zone exceed the limit values for that pollutant.
(4) A combination of measurements and modelling techniques may be used to assess ambient air quality in any zone in relation to a relevant pollutant where the levels of that pollutant over a representative period are below the relevant upper assessment thresholds.
(5) Where during any of the previous five years of measurement, concentrations of ozone in any zone have exceeded a long term objective, fixed continuous measurement must be used to assess ambient air quality in relation to ozone.
(6) Where fewer than five years' data are available to determine exceedances, a combination of measurement campaigns of short duration and results from emissions inventories and modelling may be used to assess ambient air quality in relation to ozone in a zone.
(7) Where the levels of a relevant pollutant in any zone over a representative period are below the relevant lower assessment threshold, the sole use of modelling or objective estimation techniques for assessing levels of that pollutant is permissible unless–
(a) the zone is an agglomeration; and
(b) the pollutant being assessed is sulphur dioxide or nitrogen dioxide.
(8) The upper and lower assessment thresholds for the relevant pollutants are set out in Part I of Schedule 3.
(9) Where a zone is classified in relation to a pollutant under paragraph (1)(a), modelling techniques may be used for supplementing the measurements taken in order to provide an adequate level of information on ambient air quality in relation to a relevant pollutant in that zone.
(10) The classification of zones required by paragraph (1) shall include any zones which may be classified by the Scottish Ministers as exceeding limit values for–
(a) sulphur dioxide owing to concentrations of sulphur dioxide in ambient air due to natural sources;
(b) PM10 owing to concentrations of PM10 in ambient air due to–
(i) natural events which result in concentrations significantly in excess of normal background levels from natural sources; or
(ii) the resuspension of particulates following the winter sanding of roads.
8 

(1) The Scottish Ministers shall review the classification of each zone under regulation 7 at least once in every five years in accordance with Part II of Schedule 3.
(2) The Scottish Ministers shall also review the classification of any zone under regulation 7 in the event of significant changes in activities affecting ambient concentrations in that zone of any of the relevant pollutants.
9 

(1) The Scottish Ministers shall ensure that ambient air quality is assessed in each zone by following the appropriate method for each relevant pollutant and for ozone in accordance with its current classification.
(2) Where a zone is classified under regulation 7(1)(a) or (b) in relation to a relevant pollutant–
(a) measurements of that pollutant must be taken at fixed sites either continuously or by random sampling; and
(b) the number of measurements must be sufficiently large to enable the levels of that pollutant to be properly determined.
(3) Schedule 4 shall have effect for the purposes of determining the location of sampling points for the relevant pollutants.
(4) For each zone classified under regulation 7(1)(a) in relation to a relevant pollutant, the Scottish Ministers shall ensure that the minimum number of sampling points for fixed measurements of concentrations determined in accordance with Schedule 5 is used for sampling the concentrations of that pollutant in that zone.
(5) For each zone classified under regulation 7(1)(b) in relation to a relevant pollutant, the Scottish Ministers shall ensure that the number of sampling points for fixed measurement of that pollutant in that zone, and the spatial resolution of other techniques, shall be sufficient for the concentrations of that pollutant to be established in accordance with Part I of Schedule 4 and Part I of Schedule 7.
(6) For each zone classified under regulation 7(2)(a) in relation to ozone, the Scottish Ministers shall ensure that the minimum number of fixed sampling points determined in accordance with Part III of Schedule 5 is used for sampling the concentrations of ozone in that zone.
(7) For zones to which paragraph (6) applies, the Scottish Ministers shall ensure that measurements of nitrogen dioxide are made at a minimum of 50 per cent of the ozone sampling points required by Part III of Schedule 5.
(8) The measurements of nitrogen dioxide required by paragraph (7) shall be continuous, except at rural background stations, where other measurement methods may be used.
(9) For zones within which information from sampling points for fixed measurement is supplemented by information from modelling or indicative measurement, the number of fixed sampling points required by Part III of Schedule 5 may be reduced:
Provided that–
(a) the modelling techniques adopted pursuant to regulation 7(9) provide an adequate level of information for the assessment of air quality with regard to target values, information and alert thresholds;
(b) the number of sampling points to be installed and the spatial resolution of other techniques are sufficient for the concentration of ozone to be established in accordance with the data quality objectives specified in Part III of Schedule 7 and lead to assessment results as specified in Part IV of Schedule 7;
(c) the number of sampling points in each zone amounts to at least one sampling point per two million inhabitants, or one sampling point per 50,000 km2, whichever produces the greater number of sampling points;
(d) each zone contains at least one sampling point; and
(e) nitrogen dioxide is measured at all remaining sampling points except rural background stations.
(10) The results of modelling and indicative measurements carried out in zones to which paragraph (9) applies shall be taken into account for the assessment of air quality with respect to target values.
(11) For zones where five years of measurement have been carried out and, during each of the previous five years of measurement, concentrations are below the long-term objectives, the number of continuous measurement stations shall be determined in accordance with Part IV of Schedule 5.
(12) Part II of Schedule 4 shall have effect for determining the classification and location of sampling points for the measurement of ozone.
(13) Reference methods for–
(a) the analysis of sulphur dioxide, nitrogen dioxide and oxides of nitrogen;
(b) the sampling and analysis of lead;
(c) the sampling and measurement of PM10;
(d) the sampling and analysis of benzene;
(e) the analysis of carbon MONOXIDE; and
(f) the analysis of ozone and the calibration of ozone instruments,
set out in Schedule 8 must be used unless other methods are used which the Scottish Ministers consider can be demonstrated to give equivalent results.
(14) The Scottish Ministers shall ensure that–
(a) measuring stations to supply representative data on concentrations of PM2.5 are installed if necessary and are operated using methods for the sampling and measurement of PM2.5 that they consider suitable; and
(b) sampling points for PM2.5 are, where possible, co-located with sampling points for PM10.
(15) For ozone precursor substances, the Scottish Ministers shall ensure that–
(a) at least one measuring station to supply data on concentrations of the ozone precursor substances listed in Schedule 6 is installed if necessary and is operated; and
(b) in choosing the number and siting of measuring stations for ozone precursor substances, account shall be taken of the provisions of Schedule 6.
(16) For zones which are classified under regulation 7(1)(b) or (c), the Scottish Ministers shall ensure that the information set out in Part II of Schedule 7 is compiled.
(17) For sulphur dioxide, nitrogen dioxide, oxides of nitrogen, benzene, carbon MONOXIDE and ozone measurements of volume must be standardised at a temperature of 293K and a pressure of 101,3 kPa.
10 

(1) The Scottish Ministers shall draw up action plans indicating the measures to be taken in the short term where there is any risk of the limit values for any of the relevant pollutants, or the alert thresholds for sulphur dioxide or nitrogen dioxide, being exceeded, in order to reduce that risk and to limit the duration of such an occurrence.
(2) The alert threshold for sulphur dioxide is set out in paragraph 1.2 of Part I of Schedule 1 and the alert threshold for nitrogen dioxide is set out in paragraph 2.2 of Part II of Schedule 1.
(3) The information threshold and alert threshold for ozone are set out in paragraph 1 of Part VII of Schedule 1.
(4) The Scottish Ministers shall draw up action plans indicating the measures to be taken in the short term where there is any risk of the alert threshold for ozone being exceeded if there is in their opinion significant potential to–
(a) reduce such a risk; or
(b) reduce the duration or severity of such an occurrence.
(5) In making the assessment required by paragraph (4), the Scottish Ministers shall take account of national geographical, meteorological and economic conditions.
(6) The Scottish Ministers shall, in relation to plans drawn up under paragraph (4) and in accordance with regulation 14(11), make available to the public–
(a) the results of investigations undertaken in their preparation;
(b) the plans; and
(c) information on the implementation of the plans.
11 

(1) The Scottish Ministers shall draw up a list of zones in which the levels of one or more of the relevant pollutants are higher than–
(a) in a case where there is no margin of tolerance shown in Schedule 1 in relation to a limit value, the limit value;
(b) in any other case, the limit value plus the margin of tolerance shown in Schedule 1.
(2) The Scottish Ministers shall draw up a list of zones in which the levels of one or more of the relevant pollutants are between the limit value and the limit value plus any margin of tolerance.
(3) Subject to paragraphs (6), (8) and (9), the Scottish Ministers shall draw up for each zone listed under paragraph (1) a plan or programme for attaining the limit values for the pollutants in question within the time limits specified in Schedule 1 and shall secure the implementation of the plan or programme.
(4) The plan or programme shall at least include the information listed in Schedule 9.
(5) Where in any zone the level of more that one pollutant is higher than the limit values, an integrated plan covering all the pollutants in question shall be prepared.
(6) For any zone to which regulation 7(10)(a) applies, the Scottish Ministers may determine that plans or programmes shall only be required under this regulation where the limit values are exceeded owing to man-made emissions.
(7) Plans or programmes for PM10 which are prepared in accordance with this regulation shall also have the aim of reducing concentrations of PM2.5.
(8) For any zone to which regulation 7(10)(b)(i) applies, the Scottish Ministers may determine that plans or programmes shall only be required where the limit values are exceeded owing to causes other than natural events.
(9) For zones to which regulation 7(10)(b)(ii) applies, the Scottish Ministers may determine that the plans or programmes shall only be required where the limit values are exceeded owing to PM10 levels other than those caused by the resuspension of particulates following the winter sanding of roads.
12 

(1) The Scottish Ministers shall draw up three lists of zones, namely zones in which–
(a) levels of ozone in ambient air, as assessed in accordance with regulations 7 and 9, are higher than target values;
(b) levels of ozone in ambient air, as assessed in accordance with regulations 7 and 9, are higher that the long-term objectives, but equal to or below the target levels;
(c) ozone levels meet the long-term objectives.
(2) The Scottish Ministers shall draw up and secure the implementation of, for each zone listed under paragraph (1)(a), a plan or programme for attaining the target values from the date specified in Part II of Schedule 2.
(3) The obligation in paragraph (2) will not apply if the Scottish Ministers consider that attaining the target values would not be achievable through proportionate measures.
(4) The Scottish Ministers shall, in drawing up and implementing plans or programmes under paragraph (2) ensure that, where appropriate, these are integrated with plans or programmes drawn up under regulation 10.
(5) Plans or programmes drawn up under paragraph (2) shall contain at least the information specified in Schedule 9, and shall, in accordance with regulation 14(11), be made available to the public.
(6) The Scottish Ministers shall for each zone listed under paragraph (1)(b) secure the implementation of measures which they consider to be cost-effective with the aim of achieving the long-term objectives.
(7) The Scottish Ministers shall ensure that the measures described in paragraph (6) are, at least, consistent with the plans or programmes drawn up under paragraph (2).
(8) The Scottish Ministers shall ensure, for zones to which paragraph (1)(c) applies, that–
(a) as far as factors including transboundary pollution and meteorological conditions permit, ozone levels are kept below long-term objectives; and
(b) they preserve through proportionate measures the best ambient air quality which they consider to be compatible with sustainable development and a high level of protection for the environment and human health.
13 

(1) The Scottish Ministers shall draw up a list of zones in which the levels of the relevant pollutants are below the limit values.
(2) The Scottish Ministers shall ensure that the levels of the relevant pollutants in these zones are maintained below the limit values and shall endeavour to preserve the best ambient air quality compatible with sustainable development.
14 

(1) The Scottish Ministers shall ensure that up-to-date information on ambient concentrations of each of the relevant pollutants and of ozone is routinely made available to the public in accordance with this regulation.
(2) Information on ambient concentrations of sulphur dioxide, nitrogen dioxide and particulate matter shall be updated–
(a) in the case of hourly values for sulphur dioxide and nitrogen dioxide, where practicable on an hourly basis;
(b) in all other cases, as a minimum on a daily basis.
(3) Information on ambient concentrations of lead shall be updated on a three-monthly basis.
(4) Information on ambient concentrations of benzene, as an average value over the last 12 months, shall be updated–
(a) where practicable, on a monthly basis;
(b) in all other cases, as a minimum on a three-monthly basis.
(5) Information on ambient concentrations of carbon MONOXIDE, as a maximum running average over eight hours, shall be updated–
(a) where practicable, on an hourly basis;
(b) in all other cases, as a minimum on a daily basis.
(6) The information on concentrations of ozone shall be updated–
(a) where appropriate and practicable, on an hourly basis; and
(b) in all other cases, as a minimum on a daily basis.
(7) Information made available with respect to each of the relevant pollutants shall include–
(a) an indication of the extent to which limit values and alert thresholds for relevant pollutants have been exceeded over the averaging periods specified in Schedule 1; and
(b) a short assessment of those exceedances and their effects on health.
(8) Information with respect to ozone made available shall include–
(a) indication of each time and the extent to which ozone concentrations exceeded–
(i) the long-term objectives for the protection of human health;
(ii) the information threshold; or
(iii) the alert threshold,
for the relevant averaging period; and
(b) a short assessment of those exceedances and their effects on health;
(c) comprehensive annual reports; and
(d) timely information about actual or predicted exceedances of the alert threshold.
(9) The annual reports referred to in paragraph (8)(c) shall, at least, contain–
(a) for human health, an indication of all exceedances of the target values, long-term objectives or alert thresholds for the relevant averaging period; and
(b) for vegetation–
(i) an indication of any exceedance of the target value or long-term objective; and
(ii) where appropriate, a short assessment of the effects of any such exceedance.
(10) The information referred to in paragraph (9)(b) may include, where appropriate–
(a) further information and assessments on forest protection, which sets out for suburban, rural and rural background stations, based on one hour averaging, accumulated from May to July for a report of value for each year, whether levels of ozone concentrations in ambient air exceed 6,000(g/m3 per hour; and
(b) information on ozone precursor substances insofar as these are not covered by existing Community legislation.
(11) Information and reports required to be made available by this regulation shall be published by appropriate means including, as appropriate, broadcast media, press, publications, information screens, the internet or other computer network services.
(12) The Scottish Ministers shall ensure that where information is provided to the public under paragraphs (7) and (13)–
(a) where there has been an exceedance of the information and alert threshold for ozone it shall include the information specified in paragraph 2 of Part VII of Schedule 1; and
(b) where practicable, the information specified in paragraph 2 of Part VII of Schedule 1 shall be provided where an exceedance of the information threshold or alert threshold for ozone is predicted.
(13) When an alert threshold for sulphur dioxide or nitrogen dioxide is exceeded, the Scottish Ministers shall ensure that the necessary steps are taken to inform the public, and the information made available shall as a minimum include the information specified in paragraphs 1.3 of Part I and 2.3 of Part II, as applicable, of Schedule 1.
(14) Information to be made available to the public under this regulation shall include the map mentioned in the definition of “zone” in regulation 2 and action plans, plans and programmes prepared under regulations 10 and 11 respectively.
(15) For the purposes of this regulation, the public includes, but is not limited to, health care bodies and organisations having an interest in ambient air quality and representing the interests of sensitive populations, consumers and the environment.
(16) Information made available under this regulation shall be clear, comprehensible and accessible.
15 

(1) The Scottish Ministers shall ensure that the information specified in Part I of Schedule 10 is obtained and collated.
(2) The criteria for aggregating data and calculating statistical parameters specified in Part II of Schedule 10 shall apply.
16 

(1) The Ozone Monitoring and Information Regulations 1994, the Air Quality Limit Values (Scotland) Regulations 2001 and the Air Quality Limit Values (Scotland) Amendment Regulations 2002 are hereby revoked.
(2) The Air Quality Standards Regulations 1989, insofar as they apply to Scotland, are revoked to the extent specified in paragraphs (3) and (4).
(3) Regulation 2(1) (limit values for sulphur dioxide and suspended particulates) and regulation 4(1) (limit value for lead in air) shall be revoked with effect from 1st January 2005.
(4) Regulation 6 (limit value for nitrogen dioxide in the atmosphere) shall be revoked with effect from 1st January 2010.
(5) Until 1st January 2005, if the methods prescribed by these Regulations for the assessment of suspended particulate matter are used for the purpose of demonstrating compliance with Annex IV of Council Directive 80/779/EEC of 15th July 1980 on air quality limit values and guide values for suspended particulates, the data so collected shall be multiplied by a factor of 1.2.
ALLAN WILSON
Authorised to sign on behalf of the Scottish Ministers
St Andrew’s House,
Edinburgh
10th September 2003
SCHEDULE 1
Regulations 2, 4(1), 10(2), (3), 11(1),(3), 14(12), (13)
PART I
1.1 


 Averaging period Limit value Margin of tolerance (a) Date by which limit value is to be met

1 
Hourly limit value for the protection of human health 1 hour 350 μg/m3, not to be exceeded more than 24 times a calendar year 60 μg/m3, reducing to 30μg/m3 on 1st January 2004 and to 0 μg/m3 on 1st January 2005 1st January 2005

2 
Daily limit value for the protection of human health 24 hours 125 μg/m3, not to be exceeded more than 3 times a calendar year None 1st January 2005
1.2 
500 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone, whichever is the smaller.
1.3 
Details to be made available to the public should include at least–
(a) the date, hour and place of the occurrence and the reasons for the occurrence, where known;
(b) any forecasts of–
(i) changes in concentration (improvement, stabilisation, or deterioration), together with the reasons for those changes;
(ii) the geographical area concerned; and
(iii) the duration of the occurrence;
(c) the type of population potentially sensitive to the occurrence; and
(d) the precautions to be taken by the sensitive population concerned.
PART II
2.1 


 Averaging period Limit value Margin of tolerance Date by which limit value is to be met

1 
Hourly limit value for the protection of human health 1 hour 200 μg/m3 NO2, not to be exceeded more than 18 times a calendar year 70 μg/m3, reducing on 1st January 2004 and on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010 1st January 2010

2 
Annual limit value for the protection of human health Calendar year 40 μg/m3 NO2 14 μg/m3, reducing on 1st January 2004 and on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010 1st January 2010
2.2 
400 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone or agglomeration, whichever is the smaller.
2.3 
Details to be made available to the public should include at least–
(a) the date, hour and place of the occurrence and the reasons for the occurrence, where known;
(b) any forecasts of–
(i) changes in concentration (improvement, stabilisation, or deterioration), together with the reasons for those changes;
(ii) the geographical area concerned; and
(iii) the duration of the occurrence;
(c) the type of population potentially sensitive to the occurrence; and
(d) the precautions to be taken by the sensitive population concerned.
PART III

 Averaging period Limit value Margin of tolerance Date by which limit value is to be met

1 
24-hour limit value for the protection of human health 24 hours 50 μg/m3 PM10, not to be exceeded more than 35 times a calendar year 10 μg/m3 , reducing on 1st January 2004 to 5 μg/m3 and on 1st January 2005 to 0 μg/m3. 1st January 2005

2 
Annual limit value for the protection of human health Calendar year 40 μ g/m3 PM10 3.2 μg/m3, reducing on 1st January 2004 to 1.6μg/m3 and on 1st January 2005 to 0 μg/m3 1st January 2005
PART IV

 Averaging period Limit value Margin of tolerance Date by which limit value is to be met
Annual limit value for the protection of human health Calendar year 0.5 μg/m3 0.2 μg/m3, reducing on 1st January 2004 to 0.1μg/m3 and on 1st January 2005 to 0 μg/m3 1st January 2005
PART V

 Averaging period Limit value Margin of tolerance Date by which limit value is to be met
Limit value for the protection of human health Calendar year 5μg/m3 5μg/m3 reducing on 1st January 2006 and every 12 months thereafter by 1 μg/m3 to reach 0 μg/m3 by 1st January 2010 1st January 2010
PART VI
6.1 


 Averaging period Limit value Margin of tolerance Date by which limit value is to be met
Limit value for the protection of human health Maximum daily 8-hour mean 10mg/m3 4 mg/m3 reducing on 1st January 2004 to 2 mg/m3, and to 0 mg/m3 on 1st January 2005 1st January 2005
6.2 
The maximum daily 8-hour mean concentration shall be selected by examining 8-hour running averages, calculated from hourly data and updated each hour. Each 8-hour average so calculated shall be assigned to the day on which it ends, i.e. the first calculation period for any one day shall be the period from 17:00 on the previous day to 0100 on that day; the last calculation period for any one day shall be the period from 1600 to 2400 on that day.
PART VII
7.1 


 Parameter Threshold
Information threshold 1 hour average 180μg/m3
Alert threshold 1 hour average 240μg/m3

7.2 
Details to be supplied to the public on a sufficiently large scale as soon as possible should include the following.
1 
Information on any observed exceedance–
(a) the location or area of the exceedance;
(b) the type of threshold exceeded (information threshold or alert threshold);
(c) the time at which the exceedance began and its duration; and
(d) the highest 1-hour and 8-hour mean concentration.
2 
Forecast for the following afternoon, day or days–
(a) the geographical area of expected exceedances of an information threshold or alert threshold;
(b) the expected change in pollution, that is, improvement, stabilisation or deterioration.
3 
Information on the type of population concerned, possible health effects and recommended conduct–
(a) information on population groups at risk;
(b) description of likely symptoms;
(c) recommended precautions to be taken by the population concerned; and
(d) where to find further information.
4 
Information provided under this Schedule shall also include–
(a) information on preventive action to reduce pollution or exposure to it;
(b) an indication of main source sectors; and
(c) recommendations for action to reduce emissions.
SCHEDULE 2
Regulations 5, 12(2)
PART I
1.1 
In this Schedule–
(a) all values shall be expressed in μg/m3;
(b) the volume shall be standardised at the following conditions of temperature and pressure: 293K and 101,3kPa;
(c) the time shall be specified in Central European Time;
(d) “AOT40” (expressed in (μg/m3) hours) means the sum of the difference between hourly concentrations greater than 80 (g/m3 (which equals 40 parts per billion) and 80 (g/m3 over a given period using only the 1 hour values measured between 8:00 and 20:00 Central European Time each day;
(e) in order to be valid, the annual data on exceedances used to check compliance with the target values and long-term objectives below must meet the criteria set out in Part II of Schedule 10.
PART II

 Parameter Target value for 2010

1 
Target value for the protection of human health Maximum daily 8-hour mean 120 μg/m3 not to be exceeded on more than 25 days per calendar year averaged over three years 

2 
Target value for the protection of human health AOT 40, calculated from 1H values from May to July 18,000 μg/m3.h averaged over five years



PART III

 Parameter Long-term objective

1 
Long-term objective for the protection of human health Maximum daily 8-hour mean within a calendar year 120 μg/m3

2 
Long-term objective for the protection of vegetation AOT40, calculated from 1 h values from May to July 6,000 μg/m3.h
SCHEDULE 3
Regulations 7(8), 8(1)
PART I
1.1 
The following upper and lower assessment thresholds will apply:–
(a) 

 Health protection Ecosystem protection
Upper assessment threshold 60% of 24-hour limit value (75 μg/m3), not to be exceeded more than 3 times in any calendar year 60% of winter limit value (12 μg/m3)
Lower assessment threshold 40% of 24-hour limit value (50 μg/m3), not to be exceeded more than 3 times in any calendar year 40% of winter limit value (8 μg/m3)
(b) 

 Hourly limit value for the protection of human health (NO2) Annual limit value for the protection of human health (NO2) Annual limit value for the protection of vegetation (NOx)
Upper assessment value 70% of limit value (140 μg/m3), not to be exceeded more than 18 times in any calendar year 80% of limit value (32 μg/m3) 80% of limit value (24 μg/m3)
Lower assessment value 50% of limit value (100 μg/m3), not to be exceeded more than 18 times in any calendar year 65% of limit value (26 μg/m3) 65% of limit value (19.5 μg/m3)
(c) 

 24-hour average Annual average
Upper assessment threshold 60% of limit value (30 μg/m3), not to be exceeded more than seven times in any calendar year 70% of limit value (14 μg/m3)
Lower assessment threshold 40% of limit value (20 μg/m3), not to be exceeded more than seven times in any calendar year 50% of limit value (10 μg/m3)
(d) 

 Annual average
Upper assessment threshold 70% of limit value (0.35 μg/m3)
Lower assessment threshold 50% of limit value (0.25 μg/m3)
(e) 

 Annual Average
Upper assessment threshold 70% of limit value (3.5 μg/m3)
Lower assessment threshold 40% of limit value (2 μg/m3)
(f) 

 Eight-hour average
Upper assessment threshold 70% of limit value (7mg/m3)
Lower assessment threshold 50% of limit value (5mg/m3)
PART II
2.1 
Exceedances of upper and lower assessment thresholds must be determined on the basis of concentrations during the previous five years where sufficient data are available. An assessment threshold will be deemed to have been exceeded if it has been exceeded during at least three separate years out of the previous five years.
2.2 
Where fewer than five years' data are available, measurement campaigns of short duration during the period of the year and at locations likely to be typical of the highest pollution levels may be combined with results obtained from emission inventories and modelling to determine exceedances of the upper and lower assessment thresholds.
SCHEDULE 4
Regulations 2, 9(3), (5), (12)
The following considerations will apply to fixed measurement.

PART I
1.1 
Sampling points directed at the protection of human health should be sited–
(a) to provide data on the areas within zones where the highest concentrations occur to which the population is likely to be directly or indirectly exposed for a period which is significant in relation to the averaging period of the limit value;
(b) to provide data on levels in other areas within the zones which are representative of the exposure of the general population;
(c) sampling points should in general be sited to avoid measuring very small micro-environments in their immediate vicinity. As a guideline, a sampling point should be sited to be representative of air quality in a surrounding area of no less than 200 m2 at traffic-orientated sites and of several square kilometres at urban-background sites;
(d) sampling points should also, where possible, be representative of similar locations not in their immediate vicinity;
(e) account should be taken of the need to locate sampling points on islands, where that is necessary for the protection of human health.
1.2 
Sampling points targeted at the protection of ecosystems or vegetation should be sited more than 20 km from agglomerations or more than 5 km from other built-up areas, industrial installations or motorways. As a guideline, a sampling point should be sited to be representative of air quality in a surrounding area of at least 1000 km2. A sampling point may be sited at a lesser distance or to be representative of air quality in a less extended area, taking account of geographical conditions.
1.3 

PART II

Type of station Objective of measurement Representativeness  Macroscale siting criteria
Urban Protection of human health:To assess the exposure of the urban population to ozone, i.e. where the population density and ozone concentration are relatively high and representative of the exposure of the general population. A few km2 Away from the influence of local emissions such as traffic, petrol stations etc.;Vented locations where well mixed levels can be measured;Locations such as residential and commercial areas of cities, parks (away from the trees), big streets or squares with very little or no traffic, open areas characteristic of educations, sports or recreation facilities.
Suburban Protection of human health and vegetation:To assess the exposure of the population and vegetation located in the outskirts of the agglomeration, where the highest ozone levels, to which the population and vegetation is likely to be directly or indirectly exposed, occur. Some tens of km2 At a certain distance from the area of maximum emissions, downwind following the main wind directions/s during conditions favourable to ozone formation;Where population, sensitive crops or natural ecosystems located in the outer fringe of an agglomeration are exposed to high ozone levels;Where appropriate, some suburban stations also upwind of the area of maximum emissions, on order to determine the regional background levels of ozone.
Rural Protection of human health and vegetation:To assess the exposure of population, crops and natural ecosystems to sub-regional scale ozone concentrations Sub-regional levels (a few km2) Stations can be located in small settlements and/or areas with natural ecosystems, forests or crops;Representative for ozone away from the influence of immediate local emissions such as industrial installations and roads;At open area sites, but not on higher mountain-tops.
Rural background Protection of vegetation and human health:To assess the exposure of crops and natural ecosystems to regional-scale ozone concentrations as well as exposure of the populations Regional/national/continental levels(1,000 to 10,000 km2) Station located in areas with lower population density, e.g. with natural ecosystems, forests, far removed from urban and industrial areas and away from local emissions;Avoid locations which are subject to locally enhanced formation of near-ground inversion conditions, also summits of higher mountains;Coastal sites with pronounced diurnal wind cycles of local character are not recommended.

For rural and background stations, consideration should be given, where appropriate, to co-ordination with the monitoring requirements of Commission Regulation 1091/94 concerning protection of the Community’s forests against atmospheric pollution.
PART III
3.1 
The following guidelines should be met as far as practicable:–
(a) the flow around the inlet sampling probe should be unrestricted (and, for ozone sampling, free in an arc of at least 270°) without any obstructions affecting the airflow in the vicinity of the sampler (normally some metres away from buildings, balconies, trees and other obstacles by more than twice the height the obstacle protrudes above the sampler and at least 0.5 m from the nearest building in the case of sampling points representing air quality at the building line);
(b) in general, the inlet sampling point should be between 1.5 m (the breathing zone) and 4 m above the ground. Higher positions (up to 8 m) may be necessary in some circumstances and in wooded areas. Higher siting may also be appropriate if the station is representative of a large area;
(c) the inlet probe should not be positioned in the immediate vicinity of sources in order to avoid the direct intake of emissions unmixed with ambient air;
(d) the sampler’s exhaust outlet should be positioned so that recirculation of exhaust air to the sampler inlet is avoided;
(e) in relation to the location of traffic-orientated samplers–
(i) for all pollutants, such sampling points should be at least 25 m from the edge of major junctions and at least 4 m from the centre of the nearest traffic lane;
(ii) for nitrogen dioxide and carbon MONOXIDE, inlets should be no more than 5 m from the kerbside;
(iii) for particulate matter, lead and benzene, inlets should be sited so as to be representative of air quality near to the building line;
(iv) for ozone, the inlet probe should be positioned well away from such sources as furnaces and inceration flues and more than 10m from the nearest road, with distance increasing as a function of traffic intensity.
3.2 
The following factors may also be taken into account:–
(a) interfering sources;
(b) security;
(c) access;
(d) availability of electrical power and telephone communications;
(e) visibility of the site in relation to its surroundings;
(f) safety of public and operators;
(g) the desirability of co-locating sampling points for different pollutants;
(h) planning requirements.
PART IV
4.1 
The site-selection procedures should be fully documented at the classification stage by such means as compass-point photographs of the surrounding area and a detailed map. Sites should be reviewed at regular intervals with repeated documentation to ensure that selection criteria remain valid over time.
4.2 
For ozone, this requires screening and monitoring of the monitoring data in the context of the meteorological and photochemical processes affecting the ozone concentrations measured at the respective site.
SCHEDULE 5
Regulation 9(4), (6), (7), (9), (11)
PART I
1.1 


Population of zone (thousands) If concentrations exceed the upper assessment threshold If maximum concentrations are between the upper and lower assessment thresholds For SO2 and NO2 in agglomerations where maximum concentrations are below the lower assessment thresholds
0 –250 1 1 not applicable
250 –499 2 1 1
500 –749 2 1 1
750 –999 3 1 1
1,000 –1,499 4 2 1
1,500 –1,999 5 2 1
2,000 –2,749 6 3 2
2,750 –3,749 7 3 2
3,750 –4,749 8 4 2
4,750 –5,999 9 4 2
>6,000 10 5 3
 For NO2 and particulate matter: to include at least one urban-background station and one traffic-orientated station – this requirement shall also apply to benzene and carbon MONOXIDE provided that it does not increase the number of sampling points.  
1.2 
For the assessment of pollution in the vicinity of point sources, the number of sampling points for fixed measurement should be calculated taking into account emission densities, the likely distribution patterns of ambient-air pollution and the potential exposure of the population.
PART II

If maximum concentrations exceed the upper assessment threshold If maximum concentrations are between the upper and lower assessment thresholds
1 station every 20,000 km2 1 station every 40,000 km2
In island zones the number of sampling points for fixed measurement should be calculated taking into account the likely distribution patterns of ambient-air pollution and the potential exposure of ecosystems or vegetation.
PART III

Population (× 1,000) Agglomerations (urban and suburban)  Other zones (suburban and rural  Rural background
0–250  1 1 station/50,000 km2 as an average density over all zones
251–500 1 2 “
501–1,000 2 2 “
1,001–1,500 3 3 “
1,501–2,000 3 4 “
2,001–2,750 4 5 “
2,751–3,750 5 6 “
> 3,750 1 additional station per 2 million inhabitants 1 additional station per 2 million inhabitants 


PART IV
4.1 
The number of sampling points for ozone must, in combination with other means of supplementary assessment such as air quality modelling and co-located nitrogen dioxide measurements, be sufficient to examine the trend of ozone pollution and check compliance with the long-term objectives. The number of stations located in agglomerations and other zones may be reduced to one-third of the number specified in Part III. Where information from fixed measurement stations is the sole source of information, at least one monitoring station should be kept. If, in zones where there is supplementary assessment, the result of this is that a zone has no remaining station, co-ordination with the number of stations in neighbouring zones must ensure adequate assessment of ozone concentrations against long-term objectives. The number of rural background stations should be 1 per 100,000 km2.
SCHEDULE 6
Regulations 2, 9(15)
1.1 
The main objectives of measurements of ozone precursor substances are to analyse any trend in ozone precursors, to check the efficiency of emission reduction strategies, to check the consistency of emission inventories and to help attribute emission sources to pollution concentration.
An additional aim is to support the understanding of ozone formation and precursor dispersion processes, as well as the application of photochemical models.
1.2 
Measurements of ozone precursor substances must include at least nitrogen oxides, and appropriate volatile organic compounds (VOC). A list of volatile organic compounds recommended for measurement is given below.
Ethane 1-Butene Isoprene Ethyl benzene
Ethylene trans-2-Butene n-Hexane M+p-Xylene
Acetylene cis-2-Butene i-Hexane o-Xylene
Propane 1.3-Butadiene n-Heptane 1,2,4-Trimeth. Benzene
Propene n-Pentane n-Octane 1,2,3-Trimeth. Benzene
n-Butane i-Pentane i-Octane 1,3,5-Trimeth. Benzene
i-Butane 1-Pentene Benzene Formaldehyde
 2-Pentene Toluene Total non-methane hydrocarbons
1.3 
The reference method for the analysis of oxides of nitrogen shall be ISO 7996:1985, Ambient air – determination of the mass concentrations of nitrogen oxides – chemiluminescence method
1.4 
Measurements should be taken in particular in urban and suburban areas at any monitoring site set up in accordance with the requirements of these Regulations and considered appropriate with regard to the monitoring objectives in this Schedule.
SCHEDULE 7
Regulation 9(5), (9), (16)
PART I
1.1 
The following data-quality objectives for the required accuracy of assessment methods, of minimum time coverage and of data capture of measurement are laid down to guide quality-assurance programmes.

 Sulphur dioxide, nitrogen dioxide and oxides of nitrogen Particulate matter and lead
Continuous measurement  
Accuracy 15% 25%
Minimum data capture 90% 90%
Indicative measurement  
Accuracy 25% 50%
Minimum data capture 90% 90%
Minimum time coverage 14% (One measurement a week at random, evenly distributed over the year, or eight weeks evenly distributed over the year.) 14% (One measurement a week at random, evenly distributed over the year, or eight weeks evenly distributed over the year.)
Modelling  
Accuracy  
Hourly averages 50%–60% 
Daily averages 50% 
Annual averages 30% 50%
Objective estimation  
Accuracy: 75% 100%
1.2 
The accuracy of the measurement is defined as laid down in the “Guide to the Expression of Uncertainty of Measurements” (ISO 1993) or in ISO 5725-1 “Accuracy (trueness and precision) of measurement methods and results” (ISO 1994. The percentages in the table are given for individual measurements averaged, over the period considered, by the limit value, for a 95% confidence interval (bias + two times the standard deviation). The accuracy for continuous measurements should be interpreted as being applicable in the region of the appropriate limit value.
1.3 
The accuracy for modelling and objective estimation is defined as the maximum deviation of the measured and calculated concentration levels, over the period considered by the limit value, without taking account the timing of the events.
1.4 
The requirements for minimum data capture and time coverage do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation.
1.5 
The Scottish Ministers may allow for random measurements to be made instead of continuous measurements for particulate matter and lead by methods for which accuracy within the 95% confidence interval with respect to continuous monitoring has been demonstrated to be within 10%. Random sampling must be spread evenly over the year.
1.6 
The following data quality objectives, for allowed uncertainty of assessment methods, of minimum time coverage and of data capture of measurement are provided to guide quality assurance programmes.

 Benzene Carbon monoxide
Fixed measurements  
Uncertainty 25% 15%
Minimum data capture 90% 90%
Minimum time coverage 35% urban background and traffic sites (distributed over the year to be representative of various conditions for climate and traffic) 
 90% industrial sites 
Indicative measurements  
Uncertainty 30% 25%
Minimum data capture 90% 90%
Minimum time coverage 14% (one day’s measurement a week at random, evenly distributed over the year, or 8 weeks evenly distributed over the year) 14% (one measurement a week at random, evenly distributed over the year, or 8 weeks evenly distributed over the year)
Modelling  
Uncertainty – 50%
Eight-hour averages Annual averages 50% –
Objective estimation  
Uncertainty 100% 75%
1.7 
The uncertainty (on a 95% confidence interval) of the assessment methods shall be evaluated in accordance with the “Guide to the Expression of Uncertainty of Measurements” (ISO 1993) or the methodology of ISO 5725:1994. The percentages for uncertainty in the above table are given for individual measurements averaged over the period considered by the limit value, for a 95% confidence interval. The uncertainty for the fixed measurements should be interpreted as being applicable in the region of the appropriate limit value.
1.8 
The uncertainty for modelling and objective estimation is defined as the maximum deviation of the measured and calculated concentration levels, over the period considered by the limit value, without taking into account the timing of the events.
1.9 
The requirements for minimum data capture and time coverage do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation.
1.10 
The Scottish Ministers may allow for random measurements to be made instead of continuous measurements for benzene if the uncertainty, including the uncertainty due to random sampling, meets the quality objective of 25%. Random sampling must be spread evenly over the year.
PART II
2.1 
The following information should be compiled for zones within which sources other than measurement are employed to supplement information from measurement or as the sole means of air quality assessment:–
(a) a description of assessment activities carried out;
(b) the specific methods used, with references to descriptions of the method;
(c) the sources of data and information;
(d) a description of results, including accuracies and, in particular, the extent of any area or, if relevant, the length of road within the zone over which concentrations exceed limit value or, as may be, the limit values plus applicable margins of tolerance and of any area within which concentrations exceed the upper assessment threshold or the lower assessment threshold;
(e) for limit values the object of which is the protection of human health, the population potentially exposed to concentrations in excess of the limit value.
2.2 
Where possible maps shall be compiled showing concentration distributions within each zone.
PART III
3.1 
The following data quality objectives, for allowed uncertainty of assessment methods, and of minimum time coverage and of data capture of measurement, are provided to guide quality-assurance programmes.

 For ozone, NO and NO2
Continuous fixed measurement 
Uncertainty of individual measurements 15%
Minimum data capture 90% during summer
 75% during winter
Indicative measurement 
Uncertainty of individual measurements 30%
Minimum data capture 90%
Minimum data coverage >10% during winter
Modelling 
Uncertainty 50%
1 hour averages (daytime) 50%
8 hours daily maximum 
Objective estimation 
Uncertainty 75%
3.2 
The uncertainty (on a 95% confidence interval) of the measurement methods shall be evaluated in accordance with the principles laid down in the “Guide to the Expression of Uncertainty of Measurements” (ISO 1993) of the methodology in ISO 5725-1 “Accuracy (trueness and precision) of measurement methods and results” (ISO 1994) or equivalent. The percentages for uncertainty in the table are given for individual measurements, averaged over the period for calculating target values and long-term objectives, for a 95% confidence interval. The uncertainty for continuous fixed measurements should be interpreted as being applicable in the region of the concentration used for the appropriate threshold.
3.3 
The uncertainty for modelling and objective estimation means the maximum deviation of the measured and calculated concentration levels, over the period for calculating the appropriate threshold, without taking into account the timing of events.
3.4 
“Time coverage” means the percentage of time considered for settling the threshold value during which the pollutant is measured.
3.5 
“Data capture” means the ratio of the time for which the instrument produces valid data, to the time for which the statistical parameter or aggregated value is to be calculated.
3.6 
The requirements for minimum data capture and time coverage do not include losses of data due to the regular calibration or normal maintenance of the instrumentation.
PART IV
4.1 
The following information should be compiled for zones within which sources other than measurements are employed to supplement information from measurement:–
(a) a description of the assessment activities carried out;
(b) specific methods used, with references to descriptions of the method;
(c) sources of data and information;
(d) a description of results, including uncertainties and, in particular, the extent of any area within the zone over which concentrations exceed long-term objectives or target values;
(e) for long-term objectives or target values whose object is the protection of human health, the population potentially exposed to concentrations in excess of the threshold.
4.2 
The Scottish Ministers shall ensure that maps are compiled showing concentration distributions within each zone.
SCHEDULE 8
Regulation 9(13)
PART I
ISO/FDIS 10498 (Standard in draft) Ambient air – determination of sulphur dioxide – ultraviolet fluorescence method.

PART II
ISO 7996: 1985 Ambient air – determination of the mass concentrations of nitrogen oxides – chemiluminescence method.

PART IIIA
The reference method for the sampling of lead will be that described in the Annex to Directive 82/884/EEC until such time as the limit value in Schedule 1 to these Regulations is to be met, when the reference method will be that for PM10 specified in Part IV of this Schedule.

PART IIIB
ISO 9855: 1993 Ambient air – Determination of the particulate lead content of aerosols collected in filters. Atomic absorption spectroscopy method.

PART IV
The reference method for the sampling and measurement of PM10 will be that described in EN 12341 “Air Quality – Field Test Procedure to Demonstrate Reference Equivalence of Sampling Methods for the PM10 fraction of particulate matter”. The measurement principle is based on the collection on a filter of the PM10 fraction of ambient particulate matter and the gravimetric mass determination.

PART V
The reference method for the measurement of benzene will be a pumped sampling method on a sorbent cartridge followed by gas chromatographic determination.

PART VI
The reference method for the measurement of carbon MONOXIDE will be a non-dispersive infra-red spectrometric (NDIR) method.

PART VII
The reference method for analysis of ozone shall be the UV photometric method (ISO FDIS 13964 or equivalent).

The reference method for calibration of ozone instruments shall be the Reference UV photometer method (ISO FDIS 13964, VDI 2468, B1.6 or equivalent).

SCHEDULE 9
Regulations 11(4), 12(5)
1.1 

(a) region
(b) city (map)
(c) measuring station (map, geographical coordinates).
1.2 

(a) type of zone (city, industrial or rural area)
(b) estimate of the polluted area (km2) and of the population exposed to the pollution
(c) useful climatic data
(d) relevant data on topography
(e) sufficient information on the type of targets requiring protection in the zone.
1.3 
Names and addresses of persons responsible for the development and implementation of improvement plans.
1.4 

(a) concentrations observed over previous years (before the implementation of the improvement measures)
(b) concentrations measured since the beginning of the project
(c) techniques used for the assessment.
1.5 

(a) list of the main emission sources responsible for pollution (map)
(b) total quantity of emissions from these sources (tonnes/year)
(c) information on pollution imported from other regions.
1.6 

(a) details of those factors responsible for the excess (transport, including cross border transport, formation)
(b) details of possible measures for improvement of air quality.
1.7 

(a) local, regional, national, international measures
(b) observed effects of these measures.
1.8 

(a) listing and description of all the measures set out in the project
(b) timetable for implementation
(c) estimate of the improvement of air quality planned and of the expected time required to attain these objectives.
1.9 

1.10 

SCHEDULE 10
Regulation 15(2)
PART I
1.1 
The following information on ozone concentrations shall be obtained and collated:–

 Type of station Level Averaging/ accumulation time Provisional data for each month from April to September Report for each year
Information threshold Any 180μg/m3 1 hour 
— for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values when required
— monthly 1 hour maximum ozone
— for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values, when required
Alert threshold Any 240μg/m3 1 hour – for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values, when required – for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values, when required
Health protection Any 120μg/m3 8 hours – or each day with any exceedance: date, 8 hours maximum – or each day with any exceedance: date, 8 hours maximum
Vegetation protection Suburban, rural, rural background AOT40  =6,000μg/m3.h 1 hour, accumulated from May to June  Value
Forest protection Suburban, rural, rural background AOT40  =20,000μg/m3.h 1 hour, accumulated from April to September  Value
Materials Any 40μg/m3 1 year  Value


1.2 
Where they do not do so already, annual reports must also contain–
(a) for ozone, nitrogen dioxide, oxides of nitrogen and the sums of ozone and nitrogen dioxide (added as parts per billion and expressed in (g/m3 ozone) the maximum, 99.9th, 98th and 50th percentiles and annual average and number of valid data from hourly series; and
(b) the maximum, 98th and 50th percentile and annual average from a series of daily 8 hour ozone maxima.
1.3 
Data submitted in monthly reports are considered provisional and shall be updated where necessary in subsequent submissions.
PART II
2.1 
In this Part, percentiles are to be calculated using the method specified in Council Decision 97/101/EC establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within the Member States.
2.2 
The following criteria are to be used for checking validity when aggregating data and calculating statistical parameters:–

Parameter Required proportion of valid data
1 hour values 75% (45 minutes)
8 hour values 75% of values (6 hours)
Maximum daily 8 hours mean from hourly running 8 hours averages 75% of the hourly running 8 hour averages (8 hours per day)
AOT40 90% of the 1 hour values over the time period defined for calculating the AOT40 value 
Annual mean 75% of the 1 hour values over summer (April to September) and winter (January to March, October to December) seasons separately
Number of exceedances and maximum values per month 90% of the daily maximum 8 hours mean value (27 available daily values per month)90% of the 1 hour values between 0800 and 2000 Central European Time
Number of exceedances and maximum values per year Five out of six summer months over the summer season (April to September)
