The estimated cancer risks from indoor exposure to formaldehyde and benzene.

aIURs refers to Inhalation Unit Risk Values.bOEHHA: California Office of Environmental Health Hazard Assessment.cU.S. EPA IRIS: U.S. EPA Integrated Risk Information System.dThe cancer risk estimates from Loh et al. [21] and Sax et al. [20] represented the cancer risks associated with baseline exposure to formaldehyde and benzene in both indoor and outdoor microenvironments.eMedian cancer risk values are provided for Loh et al. [21], Sax et al. [20] and Zhou et al. [36].fThe cancer risk estimates from Zhou et al. [36] represented the cancer risks associated with exposure to benzene in both indoor and outdoor microenvironment.