| VOC limits | ppm | Source |
|---|---|---|
| Methane | 5000 | IDLH |
| Ethane | 3000 | IDLH |
| Propane | 1000 | PEL |
| i-Butane | 800 | REL |
| n-Butane | 800 | REL |
| i-Pentane | 1000 | PEL |
| n-Pentane | 1000 | PEL |
| n-Hexane | 50 | REL |
| Benzene | 0.1 | REL |
| Heptane | 85 | REL |
| Ethyl Benzene | 100 | PEL |
| Toluene | 100 | REL |
| Xylenes | 100 | REL |
| Mixed (naptha) | 500 | PEL |
Source: OSHA Limits Appendix B (page 10)
NIOSH Recommended Exposure Limits (RELs)
OSHA Permissible Exposure Limits (PELs)
Immediately Dangerous to Life or Health (IDLH)
(10% of Lower and Upper Explosive Limits)