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   manufacturer to  franchised dealers  or other  persons engaged  in

   the repair,  diagnosing, or servicing  of motor vehicles or  motor

   vehicle  engines. Such information shall  also be available to the

   Administrator,  subject to  section 208(c),  in  carrying out  the

   Administrator's responsibilities under this section.".

   (b) Buses.-Section 202  of the Clean Air Act  is amended by adding

the following new subsection at the end thereof:

      "(f) Model  Years After 1990.-For  model years  prior to  model

   year  1994, the  regulations under  section  202(a) applicable  to

   buses  other than  those subject  to standards  under  section 219

   shall  contain  a  standard  which  provides   that  emissions  of

   particulate  matter  (PM)  from  such  buses may  not  exceed  the

   standards set forth in the following table:

                      "PM STANDARD FOR BUSES  

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

                 Model Year                           Standard*

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

1991.......................................................0.25

1992........................................................25

1993 and after..............................................10

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ  

   *  Standards are  expressed  in grams  per brake  horsepower  hour

(g/bhp/hr).

SEC. 208. MOTOR VEHICLE TESTING AND CERTIFICATION.

   (a) Additional  Testing  Procedures.-Section 206(a)  of the  Clean

Air Act (42 U.S.C. 7525(a)) is  amended by adding the following  after

paragraph (3):

   "(4)(A) Not later than 12  months after the date of the  enactment

of  the  Clean Air  Act Amendments  of  1990, the  Administrator shall

revise the regulations  promulgated under this subsection  to add test

procedures capable of  determining whether model  year 1994 and  later

model year  light-duty vehicles  and light-duty trucks,  when properly

maintained and used,  will pass the inspection methods  and procedures

established under section 207(b) for that model year, under conditions

reasonably likely to be  encountered in the conduct of  inspection and

maintenance programs,  but  which  those  programs  cannot  reasonably

influence   or   control.   The   conditions    shall   include   fuel

characteristics, ambient  temperature, and short (30  minutes or less)

waiting periods  before tests  are conducted. The  Administrator shall

not  grant a certificate of  conformity under this  subsection for any

1994  or later  model year  vehicle or  engine that  the Administrator

concludes  cannot  pass the  test  procedures  established under  this

paragraph.

   "(B)  From  time  to  time,  the  Administrator   may  revise  the

regulations promulgated under subparagraph  (A), as the  Administrator

deems appropriate.".

   (b) Projected  Sales Not Exceeding  300.-Section 206(a)(1) of  the

Clean Air Act  (42 U.S.C. 7525(a)(1)) is amended by striking the third

sentence and inserting  the following:  "In the case  of any  original

equipment manufacturer (as defined by the Administrator in regulations

promulgated before  the date of  the enactment  of the  Clean Air  Act

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