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· OCCUPATIONAL EXPOSURE LIMITS
Ø
Design
·
SMOKING
The concentration of contaminants in the air must be kept as low as possible. Worker exposure to a hazardous substance must not exceed the exposure limit adopted by ACGIH and set out in the 1997 Threshold Limit Values for Chemical Substances and Physical Agents and Biological Exposure Indices. The table below is excerpted from the ACGIH publication, and contains some common hazardous substances and their exposure limits. (Occupational Health and Safety Regulation 1165/96, 26)
|
Chemical name |
8-hour exposure limit |
15-minute exposure limit |
Ceiling |
|
Acetic acid |
10 ppm |
15 ppm |
-- |
|
Acetone |
500 ppm |
750 ppm |
-- |
|
Ammonia |
25 ppm |
35 ppm |
-- |
|
Carbon black |
3.5 mg/m3 |
-- |
-- |
|
Carbon dioxide |
5,000 ppm |
30,000 ppm |
-- |
|
Carbon monoxide |
25 ppm |
-- |
-- |
|
Ethyl acetate |
400 ppm |
-- |
-- |
|
Formaldehyde |
-- |
-- |
0.3 ppm |
|
Hydrogen sulfide |
10 ppm |
15 ppm |
-- |
|
Hydroquinone |
2 mg/m3 |
-- |
-- |
|
Isopropyl alcohol |
400 ppm |
500 ppm |
-- |
|
Sulfur dioxide |
2 ppm |
5 ppm |
-- |
The employer must make suitable provisions for ensuring that there is circulation of clean air, adequate ventilation and that impurities are removed from the workplace. (Occupational Health and Safety Regulation 1165/96, 11)
Whenever practicable, local exhaust ventilation must be installed close to the source of a contaminant to prevent it from entering the workplace. (Occupational Health and Safety Regulation 1165/96, 11)
The ventilation system must provide sufficient fresh air to replace all the air exhausted. (Occupational Health and Safety Regulation 1165/96, 11)
All impurities exhausted from the workplace must be prevented from re-entering the workplace. (Occupational Health and Safety Regulation 1165/96, 11)
The employer must ensure that all parts of the ventilation system are maintained, that louvers are regularly cleaned and that ventilation openings are always free of obstruction or source of contamination. (Occupational Health and Safety Regulation 1165/96, 11)
An employer must post clearly visible signs that inform
all employees in a workplace that smoking is prohibited in all work spaces
except in designated smoking areas and of the location of all the rooms and
areas which are designated smoking areas. (Smoke-Free Environment Regulations
54/05, 3)
A designated smoking room in a workplace must be ventilated
by an independent mechanical ventilation system. The system must be maintained
and monitored, and maintenance records must be kept for at least 2 years.
(Smoke-Free Environment Regulations 54/05, 6)
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