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final regulations  are not promulgated under this subsection within 18

months after the date of the enactment of the Clean Air Act Amendments

of  1990, the Administrator shall  submit a statement  to the Congress

containing an explanation  of the  reasons for  the delay  and a  date

certain  for promulgation of such final regulations in accordance with

this Act.  Such date certain shall  not be later than  15 months after

the expiration of such 18 month deadline.".  

SEC. 206. MOBILE SOURCE-RELATED AIR TOXICS.  

   Section 202 of  the Clean Air Act  (42 U.S.C. 7521) is  amended by

adding the following new subsection after subsection (k):

   "(l) Mobile Source-Related Air Toxics.-

      "(1)  Study.-Not later  than 18  months after  the date  of the

   enactment  of  the   Clean  Air   Act  Amendments  of   1990,  the

   Administrator  shall  complete  a  study  of  the  need  for,  and

   feasibility  of, controlling  emissions  of toxic  air  pollutants

   which are  unregulated under  this Act and  associated with  motor

   vehicles   and  motor  vehicle  fuels,   and  the  need  for,  and

   feasibility  of, controlling  such  emissions  and the  means  and

   measures for  such  controls.  The  study  shall  focus  on  those

   categories of emis-

   sions that pose  the greatest risk to human  health or about which

   significant uncertainties remain, including emissions  of benzene,

   formaldehyde, and 1,  3 butadiene.  The proposed  report shall  be

   available  for  public  review and  comment  and  shall  include a

   summary of all comments.

      "(2)  Standards.-Within  54  months   after  the  date  of  the

   enactment  of  the  Clean   Air  Act   Amendments  of  1990,   the

   Administrator  shall, based  on  the  study under  paragraph  (1),

   promulgate  (and  from  time to  time  revise)  regulations  under

   subsection  (a)(1)  or  section  211(c)(1)  containing  reasonable

   requirements  to  control  hazardous  air  pollutants  from  motor

   vehicles and  motor vehicle fuels.  The regulations shall  contain

   standards  for  such  fuels  or   vehicles,  or  both,  which  the

   Administrator determines reflect  the greatest degree of  emission

   reduction achievable through  the application of  technology which

   will  be  available,  taking  into   consideration  the  standards

   established under  subsection (a), the  availability and costs  of

   the technology,  and noise, energy,  and safety factors, and  lead

   time. Such  regulations shall not  be inconsistent with  standards

   under section  202(a). The regulations shall,  at a minimum, apply

   to emissions of benzene and formaldehyde.".

SEC. 207. EMISSION CONTROL DIAGNOSTICS SYSTEMS AND BUSES.  

   (a) Emission  Control Diagnostics.-Section  202 of  the Clean  Air

Act  (42 U.S.C.  7521)  is  amended  by  adding  the  following  after

subsection (l):  

   "(m) Emissions Control Diagnostics.-

      "(1) Regulations.-Within  18 months after the  enactment of the

   Clean  Air  Act  Amendments  of  1990,   the  Administrator  shall

   promulgate    regulations    under   subsection    (a)   requiring

   manufacturers to install  on all new light duty vehicles and light

   duty trucks diagnostics systems capable of-

         "(A) accurately identifying for the vehicle's useful life as

      established  under  this   section,  emission-related   systems

      deterioration or  malfunction,  including, at  a  minimum,  the

      catalytic  converter and  oxygen sensor,  which could  cause or

      result  in failure  of  the vehicles  to  comply with  emission

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