
1 
These Regulations may be cited as the Clean Air (Units of Measurement) Regulations 1992 and shall come into force on 5th February 1992.
2 

(1) The Clean Air Act 1956 shall be amended as follows.
(2) In section 3(4) for “fifty-five thousand or more British thermal units per hour” substitute “16.12 kilowatts or more”.
(3) In section 6(1) (b) for “one ton” substitute “1.02 tonnes”.
(4) In section 7(1) (b) for “100 pounds” substitute “45.4 kilograms”.
(5) In section 7(1) (c) for “1¼ million or more British thermal units an hour” substitute “366.4 kilowatts or more”.
3 

(1) The Clean Air Act 1968 shall be amended as follows.
(2) In section 2(5) for “55,000 British thermal units per hour” substitute “16.12 kilowatts”.
(3) In section 3(1) (b) for “100 pounds” substitute “45.4 kilograms”.
(4) In section 3(1) (c) for “1¼ million or more British thermal units an hour” substitute “366.4 kilowatts or more”.
(5) In section 5(3) (a) for “one ton” substitute “1.02 tonnes”.
(6) In section 5(3) (b) for “28 million British thermal units an hour” substitute “8.21 Megawatts”.
Michael Heseltine
One of Her Majesty’s Principal Secretaries of State
10th January 1992