Sec.  214.  (a)(1)  The  Administrator shall  conduct  a  study
concerning  the  effects on  health  and  welfare of  particulate
emissions from  motor vehicles or motor vehicle  engines to which
section 202  applies. Such study shall  characterize and quantify
such emissions and analyze the  relationship of such emissions to
various fuels and fuel additives.
  (2) The  study shall also  include an  analysis of  particulate
emissions from  mobile sources  which are not  related to  engine
emissions  (including,  but  not  limited  to  tire  debris,  and
asbestos from brake lining).
  (b) The Administrator shall report to the Congress the findings
and results of the study conducted under subsection (a) not later
than two years  after the date of the enactment  of the Clean Air
Act  Amendments   of  1977.   Such  report  shall   also  include
recommendations for  standards or methods to regulate particulate
emissions described in paragraph (2) of subsection (a).
[42 U.S.C. 7548]