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the area's  design value as of  the attainment date, whether  the area

attained  such standard  by  December 31,  1991. If  the Administrator

determines  that the  area  attained the  standard, the  Administrator

shall require, as part of the order, the State to submit a maintenance

plan  for the  area within  12 months  of  such determination.  If the

Administrator determines that the area failed to  attain the standard,

the  Administrator  shall, by  June 30,  1992,  designate the  area as

nonattainment under section 107(d)(4).

"SEC. 185B. NOx AND VOC STUDY.

   "The Administrator,  in conjunction with  the National Academy  of

Sciences, shall  conduct a  study on the  role of ozone  precursors in

tropospheric  ozone formation and control. The study shall examine the

roles of NOx  and VOC  emission reductions,  the extent  to which  NOx

reductions may contribute (or  be counterproductive) to achievement of

attainment in different nonattainment  areas, the sensitivity of ozone

to the control of NOx, the availability and extent of con-

trols for  NOx, the  role  of biogenic  VOC emissions,  and the  basic

information required  for  air  quality  models. The  study  shall  be

completed and a proposed report made public for 30 days comment within

1 year of the date of the enactment of the Clean Air Act Amendments of

1990, and a  final report  shall be  submitted to  Congress within  15

months after such date of  enactment. The Administrator shall  utilize

all available  information and studies, as well  as develop additional

information, in conducting the study required by this section.".

SEC.  104. ADDITIONAL  PROVISIONS  FOR  CARBON MONOXIDE  NONATTAINMENT

AREAS.

   Part D  of title I of the  Clean Air Act is  amended by adding the

following new subpart at the end:

 "Subpart 3-Additional Provisions for Carbon Monoxide Nonattainment

Areas

"Sec. 186. Classifications and attainment dates.

"Sec. 187. Plan submissions and requirements.

"SEC. 186. CLASSIFICATION AND ATTAINMENT DATES.

   "(a) Classification  by Operation of Law  and Attainment Dates for

Nonattainment Areas.-(1) Each area designated nonattainment for carbon

monoxide pursuant to section 107(d) shall be classified at the time of

such designation under  table 1, by  operation of law,  as a  Moderate

Area or a  Serious Area based  on the design  value for the area.  The

design  value  shall be  calculated  according  to the  interpretation

methodology issued  by the Administrator most recently before the date

of  the enactment of  the Clean Air  Act Amendments of  1990. For each

area classified under this subsection, the primary standard attainment

date  for carbon monoxide shall be as expeditiously as practicable but

not later than the date provided in table 1:

                              "TABLE 3

                                                Primary standard  

Area classification    Design value            Attainment date

ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ

Moderate........... 9.1-16.4 ppm..............   December 31, 1995

Serious............ 16.5 and above............   December 31, 2000

   "(2)  At the  time  of publication  of  the notice  required under

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