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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