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| OEL-CL |
OEL-RL: |
A-B | C-C | D-D | E-E | F-L | M-M | N-O | P-P | Q-S | T-T | U-Z |
|
DOL OEL-RL |
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N - O |
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|
Substance |
TWA OEL-RL |
Short Term OEL-RL |
Notes | ||
| ppm | mg/m3 | ppm | mg/m3 | ||
| Naled (ISO) | - | 3 | - | 6 | - |
| Naphtalene | 10 | 50 | 15 | 75 | - |
| 1,5-Naphtylene diisocyanate | - | 0.02 | - | 0.07 | Sen |
| Nickel carbonyl | - | - | 0.1 | 0.24 | - |
| Nickel, organic compounds (as Ni) | - | 1 | - | 3 | - |
| Nicotine | - | 0.5 | - | 1.5 | Sk |
| Nitrapyrin | - | 10 | - | 20 | - |
| Nitric acid | 2 | 5 | 4 | 10 | - |
| Nitric oxide | 25 | 30 | 35 | 45 | - |
| 4-Nitroaniline | - | 6 | - | - | Sk |
| Nitrobenzene | 1 | 5 | 2 | 10 | Sk |
| Nitroethane | 100 | 310 | - | - | - |
| Nitrogen dioxide | 3 | 5 | 5 | 9 | - |
| Nitrogen monoxide | 25 | 30 | 35 | 45 | - |
| Nitrogen trifluoride | 10 | 30 | 15 | 45 | - |
| Nitroglycerine | 0.2 | 2 | 0.2 | 2 | Sk |
| Nitromethane | 100 | 250 | 150 | 375 | - |
| 1-Nitropropane | 25 | 90 | - | - | - |
| 2-Nitropropane | 10 | 36 | 20 | 72 | - |
| Nitrotoluene, all isomers | 5 | 30 | 10 | 60 | Sk |
| Nitrous oxide | 100 | 180 | - | - | - |
| Octachloronaphtalene | - | 0.1 | - | 0.3 | Sk |
| n-Octane | 300 | 1450 | 375 | 1800 | - |
| Orthophosphoric acid | - | 1 | - | 3 | - |
| Osmium tetraoxide (as Os) | 0.0002 | 0.002 | 0.0006 | 0.006 | - |
| Oxalic acid | - | 1 | - | 2 | - |
| Oxalonitrile | 10 | 20 | - | - | - |
| 2,2'-Oxydiethanol | 23 | 100 | - | - | - |
| Ozone | 0.1 | 0.2 | 0.3 | 0.6 | - |