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Table 2 ATSDR minimal risk levels and EPA IRIS cancer risk levels for chemicals of concern (all data in μg/m 3 )

From: Air concentrations of volatile compounds near oil and gas production: a community-based exploratory study

Chemical ATSDR MRLs IRIS cancer risk levels
Acute Intermediate Chronic 1/1,000,000 1/100,000 1/10,000
Benzene 29 20 10 .45 4.5 45
1,3 butadiene     0.03 0.3 3
Ethylbenzene 21,700 8,680 260    
Formaldehyde 49 37 10 0.08 0.8 8
N-hexane    2,115    
Hydrogen sulfide 98 28     
Toluene 3,750   300    
Xylenes 8,680 2,604 217