Table 2.

Predicted excess cancer risks for adult participants in RIOPA (n = 239).

VOCs	Unit risk (μg m−3)−1	Predicted excess cancer cases per million population
		50th	90th	95th
Benzene	7.8 × 10−6	20.4	53.0	76.6
Ethylbenzene	2.5 × 10−6	4.4	13.0	19.0
MTBE	2.6 × 10−7	2.1	6.6	11.6
Styrene	2.0 × 10−6	1.5	5.8	12.9
1,4-DCB	1.1 × 10−5	24.5	908.9	3620.7
TCE	2.0 × 10−6	0.4a	2.2	4.6
PERC	5.9 × 10−6	5.9	24.1	47.1
Chloroform	2.3 × 10−5	28.9	97.1	147.5
CTC	1.5 × 10−5	9.3	12.9	15.0
Immunotoxicant mixture	NA	76.4	965.4	3651.5
Liver and kidney toxicant mixture	NA	111.1	1102.2	3683.6
Total VOCs	NA	141.1	1125.0	3710.1

NA, not available.

Immunotoxicant mixture includes benzene, MTBE, 1,4-DCB, TCE and PERC; Liver and kidney toxicant mixture includes ethylbenzene, MTBE, 1,4-DCB, TCE, PERC, chloroform and CTC.

^aConcentrations were based on MDLs.