assessment, using authorities under this Act including sections
111 and this section.
"(6) Hydrofluoric acid.-Not later than 2 years after the date
of enactment of the Clean Air Act Amendments of 1990, the
Administrator shall, for those regions of the country which do
not have comprehensive health and safety regulations with respect
to hydrofluoric acid, complete a study of the potential hazards
of hydrofluoric acid and the uses of hydrofluoric acid in
industrial and commercial applications to public health and the
environment considering a range of events including worst-case
accidental releases and shall make recommendations to the
Congress for the reduction of such hazards, if appropriate.
"(7) RCRA facilities.-In the case of any category or
subcategory of sources the air emissions of which are regulated
under subtitle C of the Solid Waste Disposal Act, the
Administrator shall take into account any regulations of such
emissions which are promulgated under such subtitle and shall, to
the maximum extent practicable and consistent with the provisions
of this section, ensure that the requirements of such subtitle
and this section are consistent.
"(o) National Academy of Sciences Study.-
"(1) Request of the academy.-Within 3 months of the date of
enactment of the Clean Air Act Amendments of 1990, the
Administrator shall enter into appropriate arrangements with the
National Academy of Sciences to conduct a review of-
"(A) risk assessment methodology used by the Environmental
Protection Agency to determine the carcinogenic risk associated
with exposure to hazardous air pollutants from source
categories and subcategories subject to the requirements of
this section; and
"(B) improvements in such methodology.
"(2) Elements to be studied.-In conducting such review, the
National Academy of Sciences should consider, but not be limited
to, the following-
"(A) the techniques used for estimating and describing the
carcinogenic potency to humans of hazardous air pollutants; and
"(B) the techniques used for estimating exposure to
hazardous air pollutants (for hypothetical and actual maximally
exposed individuals as well as other exposed individuals).
"(3) Other health effects of concern.-To the extent
practicable, the Academy shall evaluate and report on the
methodology for assessing the risk of adverse human health
effects other than cancer for which safe thresholds of exposure
may not exist, including, but not limited to, inheritable genetic
mutations, birth defects, and reproductive dysfunctions.
"(4) Report.-A report on the results of such review shall be
submitted to the Senate Committee on Environment and Public
Works, the House Committee on Energy and Commerce, the Risk
Assessment and Management Commission established by section 303
of the Clean Air Act Amendments of 1990 and the Administrator not
later than 30 months after the date of enactment of the Clean Air
Act Amendments of 1990.
"(5) Assistance.-The Administrator shall assist the Academy in
gathering any information the Academy deems necessary to carry
out this subsection. The Administrator may use any authority
under this Act to obtain information from any person, and to