SEC. 2. OPTION FOR EXPANDED MONITORING. 
(a) IN GENERAL.—Section 110(a) of the Clean Air 
Act (42 U.S.C. 7410(a)) is amended by inserting after 
paragraph (3) the following: 
‘‘(4) OPTION FOR EXPANDED MONITORING.— 
‘‘(A) IN GENERAL.—Any State may include in 
a State implementation plan a program for moni-
toring one or more covered criteria air pollutants in 
one or more designated areas by— 
‘‘(i) continuing to use the monitoring sys-
tem (including for purposes of baseline meas-
urements) that was in operation as of the sub-
mission of the revision to the plan; and 
‘‘(ii) greatly increasing the number of air 
quality sensors, which may include mobile sen-
sors, for such monitoring system. 
‘‘(B) STATE DISCRETION.—Subject to subpara-
graphs (C) and (D), the Administrator shall allow a 
State to make a revision to a State implementation 
plan in accordance with subparagraph (A) at the 
State’s discretion. 
‘‘(C) ENSURING QUALITY.—On an annual basis, 
each State that conducts monitoring pursuant to 
this paragraph, as a condition on the continuation of 
such monitoring, shall demonstrate to the Adminis-
trator that the quality of the data produced through 
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such monitoring is at least as good as the quality of 
the data that would be produced for the respective 
air pollutants in the respective designated areas if 
the State did not exercise the option to conduct 
monitoring pursuant to this paragraph. 
‘‘(D) REVIEW BY ADMINISTRATOR.—A State’s 
annual demonstration under subparagraph (C) is 
deemed to have met the standard described in such 
subparagraph unless the Administrator issues a 
written response— 
‘‘(i) finding that such standard is not met; 
and 
‘‘(ii) explaining the basis for such finding. 
‘‘(E) GREATER
REGULATORY
FLEXIBILITY.— 
With respect to each designated area in which a 
State conducts monitoring pursuant to this para-
graph, subject to subparagraphs (C) and (D), the 
Administrator— 
‘‘(i) shall not take any action to enforce 
any requirement concerning the method of mon-
itoring the criteria air pollutant involved in the 
area involved, unless the Administrator finds 
that the applicant is acting in bad faith; and 
‘‘(ii) shall allow the State involved to base 
any determination on whether an exceedance of 
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the national ambient air quality standard for 
the criteria air pollutant involved has occurred 
on data derived from monitoring pursuant to 
this paragraph. 
‘‘(F) DEFINITIONS.—In this paragraph: 
‘‘(i) The term ‘covered criteria air pollut-
ant’ means an air pollutant for which air qual-
ity criteria have been issued under section 
108(a), except that such term does not include 
carbon monoxide or nitrogen dioxide. 
‘‘(ii) The term ‘designated area’ means an 
area that is designated under section 107(d) as 
being in nonattainment, in attainment, or 
unclassifiable.’’. 
(b) REGULATIONS.—Not later than 12 months after 
the date of enactment of this Act, the Administrator of 
the Environmental Protection Agency shall promulgate 
final regulations to implement section 110(a)(4) of the 
Clean Air Act, as added by subsection (a). Such regula-
tions shall specify how a State must demonstrate to the 
Administrator, as required by subparagraph (C) of such 
section 110(a)(4), that the quality of the data produced 
through monitoring pursuant to such section 110(a)(4) is 
at least as good as the quality of the data that would be 
produced for the respective air pollutants in the respective 
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areas if the State did not exercise the option to conduct 
monitoring pursuant to such section 110(a)(4). 
Æ 
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