by the United States government, United States Code — Title 42, Chapter 85…
“ An evaluation, within 12 months after November 15, 1990, of each of the hazardous air pollutants listed under section 7412 (b) of this title, to decide, on the basis of available information, their relative priority for preparation of environmental health assessments pursuant to subparagraph :: (C) . The evaluation shall be based on reasonably anticipated toxicity to humans and exposure factors such as frequency of occurrence as an air pollutant and volume of emissions in populated areas. Such evaluation shall be reviewed by the Interagency Task Force established pursuant to subparagraph (A) . ”
