substances to the list as additional data are developed and assessed. No time frame has been established for addition of substances to the list. F. Lists of Hazardous Air Pollutants Sections 108(a), lll(d), and 112(b)(i)(A) of the Clean Air Act Amendments of 1970 require that the Administrator of the EPA publish, and from time to time revise, three lists of hazardous air pollutants. defined in the amendments, a hazardous air pollutant is an air pollutant . . . which may reasonably be anticipated to result in an increase in mortality or an increase in serious, irreversible, or incapaci-tating reversible, illness. The EPA Office of Air Quality Planning and