Laboratories Offering Home Testing
PFAS MCLs and Drinking Water
PFAS Sites and Areas of Interest
There are two major classes of firefighting foam: Class A and Class B. Class B is also called Aqueous film forming foam (AFFF) and is usually created using PFAS. It is a highly effective foam used for fighting high-hazard flammable liquid fires, like gasoline, oil, and jet fuel.
Official Correspondence
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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 |
| PFNA | 1 | annual |
| PFBS | 2600 | annual |
| PFHxA | 10,000 | 8 hour |
| PFHxS | 2 | annual |
| HXPO-DA (GenX) | 0.1 | annual |
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.