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. 2007 May 15;115(8):1160–1168. doi: 10.1289/ehp.9884

Table 4.

Cancer unit risks and potency factors per μg/m3.

Compound U.S. EPA California (OEHHA)
1,3-Butadiene 3.00 × 10−5 1.70 × 10−4
Methylene chloride 4.70 × 10−7 1.00 × 10−6
Chloroform 2.30 × 10−5 5.30 × 10−6
Benzene (high/low for U.S. EPA) 7.8a/2.20 × 10−6 2.90 × 10−5
Carbon tetrachloride 1.50 × 10−5 4.20 × 10−5
Trichloroethylene NA 2.00 × 10−6
Perchloroethylene NA 5.90 × 10−6
1,4-Dichlorobenzene NA 1.10 × 10−5
Formaldehyde 1.30 × 10−5 6.00 × 10−6
Acetaldehyde 2.20 × 10−6 2.70 × 10−6
1,3-dichloropropene 4.00 × 10−6 NA
Ethylene dibromide (central/high for U.S. EPA) 3.00/6.00 × 10−4b 7.10 × 10−5
Ethylene dichloride 2.60 × 10−5 2.10 × 10−5
Vinyl chloride (continuous adult) 4.40 × 10−6 NA
Vinyl chloride (continuous from birth) 8.80 × 10−6c 7.80 × 10−5
BaP (inhalation) NA 1.10 × 10−3
BaP [oral slope factor (mg/kg/day) – 1] 7.3 12
Dioxin [oral slope factor (pg/kg/day) – 1] 1.00 × 10−3 1.30 × 10−4

NA, not applicable.

a

Used higher estimate for comparisons.

b

Used upper-bound estimate for comparisons.

c

Used continuous from birth for comparisons.