California's regulations for air toxics require the application of multimedia assessment of human health risk. This approach requires knowledge of intermedia transfer factors (lTFs) for specific toxic air pollutants. In order to meet the above need, a critically evaluated information base on ITFs was developed for a selected number of air toxics. The specific chemicals were selected in order to allow the assessment of ITFs for the following chemical classes: (1) volatile organics (benzene), (2) hydrophilic / reactive volatile organic compounds (formaldehyde), (3) volatile chlorinated low molecular weight hydrocarbons (methylene chloride), (4) particle-bound organics (benzo(a)pyrene and 2,3,7,8-TCDD), (5) reactive metals (chromium VI) and (6) metals that are mobilized through formation of organo-metallic compounds (mercury). Experimental data and estimates of ITFs for the above chemicals were critically evaluated. Detailed reports for seven compounds were prepared and are available as separate chemical-specific volumes of ITF information. The complete set of chemical-specific ITF volumes prepared in this project should provide a useful resource for future development of ITF estimation methods for specific chemical classes.
For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753
Stay involved, sign up with CARB's Research Email Distribution List