Michigan Air Toxics Screening Levels
Values are listed in micrograms per cubic meter (µg/m³)
| Specific PFAS | ITSL (µg/m³) | ITSL Averaging Time |
|---|---|---|
| PFOS | 0.0004 | 24 hour |
| PFOA | 0.0001 | 24 hour |
| 6:2 Fluorotelomer sulfonic acid | 1 | annual |
| (Perfluorobutyl)ethene | 2600 | annual |
| (Perfluorobutyl)ethene | 10,000 | 8 hour |
| Dichloro(methyl)[(perfluorobutyl)ethyl]silane | 2 | annual |
| Fomblin perfluorpolyether | 0.1 | annual |
About the Initial Threshold Screening Levels for PFAS in Michigan
- Effective: The effective dates for each PFAS ITSL are different. As science evolves, the PFAS ITSLs are evaluated and updated. All PFAS ITSLs listed are effective as of April 25, 2024.
- Regulatory authority: Rule 336.1225(1) et. seq. of the Michigan Administrative Code promulgated pursuant to Part 55, Air Pollution Control, of the Natural Resources and Environmental Protection Act (NREPA), 1994 PA 451, as amended.
Screening levels are health-based values used to evaluate ambient air concentrations resulting from industrial source air emissions.
Learn more about what Initial Threshold Screening Levels are, how they're determined, and other related topics at Michigan's air toxics program.