
1 
These Regulations may be cited as the Control of Substances Hazardous to Health (Amendment) Regulations 1997 and shall come into force on 9th January 1997.
2 
For the following provisions of the Schedule to the Control of Substances Hazardous to Health (Amendment) Regulations 1996—“

Substance Formula Reference periods
  Long-term maximum exposure limit (8-hour TWA reference period)
  ppm mg m−3
    Short-term maximum exposure limit (15-minute reference period)
    ppm mg m−3
Cobalt and cobalt compound (as Co) Co — — Cotton dust
— 2.5 — — 1,2–
Dibromoethane (Ethylene dibromide) BrCH2CH2Br 0.5 3.9 — —”
there shall be substituted the following—“

Substance Formula Reference periods
  Long-term maximum exposure limit (8-hour TWA reference period)
  ppm mg m−3
    Short-term maximum exposure limit (15-minute reference period)
    ppm mg m−3
Cobalt and cobalt compound (as Co) Co — 0.1 — —
Cotton dust  — 2.5 — —
Dibromoethane (Ethylene dibromide) BrCH2CH2Br 0.5 3.9 — —”
Signed by authority of the Secretary of State.
Paul Beresford
Parliamentary Under Secretary of State,
Department of Environment
January 1997