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Michigan Air Toxics System
Initial Threshold Screening Level/Initial Risk Screening Level (ITSL/IRSL)
Toxics Screening Level Query

Use the following search fields to locate information on screening levels for specific chemicals. To learn more about the Michigan Air Toxics Program, visit the Michigan Air Toxics Program Web page in the Web portal. Data is updated on a weekly basis.
You may also download the entire ITSL/IRSL table here:
Microsoft Access format -
Microsoft Excel format -

Chemical Name: (any part of name)
CAS Number:


For issues related to ITSL/IRSL database content, contact Doreen Lehner at or (517) 284-6753. Home  |   DEQ_Home  |   BFS_Home  |   Online Services  |   Permits  |   Programs  |   Site Map  |   Contact DEQ  |   Contact BFS
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