Table 2. Cancer potency factors for carcinogenic chemicals of concern (Layton et al., 1990).

Chemical	     Oral cancer potency (mg/kg-d)-1	 Inhalation cancer potency (mg/kg-d)-1


Carbon tetrachloride		0.13					0.13

Chloroform			0.0061					0.0081

1,1-DCE				0.6					1.2

PCE				0.051					0.0033

TCE				0.011					0.017

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