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·
OCCUPATIONAL
EXPOSURE LIMITS
Ø
Design
· SMOKING
Worker exposure to a hazardous substance must not exceed the exposure limit specified in table 21 in the regulation. The table below is excerpted from table 21, and contains some common hazardous substances and their exposure limits.
|
Chemical name |
8-hour exposure limit |
15-minute exposure limit |
Ceiling |
|
Acetic acid |
10 ppm |
15 ppm |
-- |
|
Acetone |
250 ppm |
500 ppm |
-- |
|
Ammonia |
25 ppm |
35 ppm |
-- |
|
Carbon black |
3.5 mg/m3 |
7 mg/m3 |
-- |
|
Carbon dioxide |
5,000 ppm |
15,000 ppm |
-- |
|
Carbon monoxide |
25 ppm |
100 ppm |
-- |
|
Ethyl acetate |
150 ppm |
-- |
-- |
|
Formaldehyde |
0.3 ppm |
-- |
1 |
|
Hydrogen sulfide |
-- |
-- |
10 |
|
Hydroquinone |
-- |
-- |
2 |
|
Isopropyl alcohol |
400 ppm |
500 ppm |
-- |
|
Sulfur dioxide |
2 ppm |
5 ppm |
-- |
(Occupational Health and Safety Regulation 1996, 307)
When a worker is exposed to hazardous airborne concentrations of a contaminant, written procedures must be developed and implemented. The procedures must identify the substances workers are exposed to, the conditions of work allowed, and preventative steps to ensure that workers are not exposed to harmful concentrations. (Occupational Health and Safety Regulation 1996, 307)
The employer must ensure that there is adequate ventilation of the workplace. Contaminants must be rendered harmless by providing clean air and circulation. Mechanical ventilation must be provided where contaminants are likely to be hazardous to workers or where there is a large quantity. (Occupational Health and Safety Regulation 1996, 65-66)
Where practical, local exhaust should be provided and be near the point of origin of the contaminants. (Occupational Health and Safety Regulation 1996, 66)
Sufficient fresh and tempered air must be provided to replace exhausted air. (Occupational Health and Safety Regulation 1996, 66)
A mechanical ventilation system must be constructed and maintained to minimize bacterial growth and insects. Components must be readily accessible for cleaning and inspection. (Occupational Health and Safety Regulation 1996, 67)
A competent person must maintain the ventilation system. (Occupational Health and Safety Regulation 1996, 67)
Airborne contaminants must be exhausted clear of the workplace and prevented from re-entering. If an air cleaning system is used for recirculated air, it must be designed, installed, and maintained to remove particles and gaseous contaminants to protect workers. (Occupational Health and Safety Regulation 1996, 66)
Smoking must only be permitted in designated areas. Signs must be posted where smoking is permitted. (Occupational Health and Safety Regulation 1996, 77)
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