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

The results of your search are displayed below. Click any column heading to sort.
Click here to see descriptions of column headings.
If a number appears in the "notes" column for a given, chemical, see the definition on the bottom of this page.
 
It is possible to cut and paste the table below into a spreadsheet program for further manipulation.

Page 1 of 51 - 1271 record(s) matched your criteria

CAS Number Chemical Name Notes Status ITSL (μg/m3) Averaging Time Second ITSL (μg/m3) Second ITSL Avg Time IRSL
(μg/m3)
SRSL
(μg/m3)
Carc Avg Time
75376 1,1-difluoroethane   FINAL 400000 annual          
431890 hfc-227ea 13 FINAL 130000 annual 5560000 1 hr      
115117 isobutylene   FINAL 110000 annual          
811972 1,1,1,2-tetrafluoroethane   FINAL 80000 annual          
76142 dichlorotetrafluoroethane   FINAL 69000 8 hr          
75683 1-chloro-1,1-difluoroethane   FINAL 50000 annual          
75456 chlorodifluoromethane   FINAL 50000 annual          
75285 isobutane 22 FINAL 23800 8 hr          
106978 butane 22 FINAL 23800 8 hr          
67561 methanol   FINAL 20000 24 hr 28000 1 hr      
76131 1,1,2-trichloro-1,2,2-trifluoroethane   FINAL 19140 24 hr          
64175 ethyl alcohol   FINAL 19000 1 hr          
78784 2-methyl butane   FINAL 17700 8 hr          
109660 pentane   FINAL 17700 8 hr          
107835 2-methylpentane   FINAL 17600 8 hr          
287923 cyclopentane   FINAL 17200 8 hr          
74997 methyl acetylene   FINAL 16500 8 hr          
108872 methylcyclohexane   FINAL 16000 8 hr          
1717006 1,1-dichloro-1-fluoroethane   FINAL 12800 annual          
60297 ethyl ether   FINAL 12000 8 hr          
74975 chlorobromomethane   FINAL 10600 8 hr          
75003 ethyl chloride   FINAL 10000 24 hr          
110838 cyclohexene   FINAL 10000 8 hr          
110838 cyclohexene   FINAL 10000 8 hr          
637923 ethyl tertiary butyl ether   FINAL 9000 annual          
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    Notes: For a list of notes which correspond to any numbers which may appear in the “Notes” column above, please follow this link.
https://www.michigan.gov/egle/-/media/Project/Websites/egle/Documents/Programs/AQD/toxics/itsl-irsl-screening-level-footnotes.pdf  

 
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For issues related to ITSL/IRSL database content, contact Doreen Lehner at lehnerD@michigan.gov or (517) 582-3779.


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