|
|
Meaning |
|
Level ng/L (µg/M3) |
Level ng/L (µg/M3) |
|
|
Less than 200 |
Less than 200 |
Ideal |
|
200-300 |
200-350 |
Good |
|
300-400 |
350-500 |
Acceptable |
|
400-500 |
500-700 |
Marginal |
|
More than 500 |
More than 700 |
Poor; the higher the number, the worse the problem |
Production/Manufacturing |
Meaning |
|
Level ng/L (µg/M3) |
|
|
Less than 500 |
Ideal |
|
500-700 |
Good |
|
700-1000 |
Acceptable |
|
1000-1500 |
Marginal |
|
More than 1500 |
Poor; employee complaints probable; the higher the number, the worse the problem |
|
1500-3000 |
Exposure effects possible |
|
3000-25000 |
Exposure effects probable |
|
More than 25000 |
Toxic range, potential neurological effects |
