Threshold Limit Values of Common (in ppm) Gases and Volatile Liquids
The following table lists threshold limit values(TLV) in parts per million (ppm) of a variety of substances in air at 25 degree C. Threshold limit values are concentrations of gas to which nearly all workers could be exposed for periods of months without adverse effect. Somewhat higher concentrations could be experienced for shorter periods.
| Benzene | 10 |
| Diborane | 0.1 |
| Carbon Monoxide | 25 |
| Fluorine | 1 |
| n-Hexane | 50 |
| Hydrazine | 0.1 |
| Hydrogen Floride Anhydrous | 3 |
| Hydrogen Selenide | 0.05 |
| Methanol | 200 |
| Iron Pentacarbonyl | 0.1 |
| Mercury | 0.02 |
| Toluene | 50 |
1