Ill. Admin. Code tit. 35, § 243.124 - Nitrogen Oxides (Nitrogen Dioxide as Indicator)
a) The level of the 1971 primary annual
average NAAQS for nitrogen oxides is 53 ppb, annual average concentration,
measured in the ambient air as nitrogen dioxide
(NO2).
b)
The level of the 2010 primary one-hour NAAQS for nitrogen oxides is 100 ppb,
one-hour average concentration, measured in the ambient air as
NO2.
c) The
level of the 1971 secondary annual average NAAQS for nitrogen oxides is 0.053
ppm (100 µg/m3), annual arithmetic mean
concentration, measured in the ambient air as
NO2.
d) The
levels of the standards in subsections (a) through (c) of this Section must be
measured by:
1) An FRM based on appendix F to
40 CFR 50, incorporated by reference in Section
243.108,
and designated by USEPA and listed in the List of Designated Methods,
incorporated by reference in Section 243.108; or
2) By an FEM designated by USEPA and listed
in the List of Designated Methods, incorporated by reference in Section
243.108.
e) The 1971
primary annual average NAAQS for nitrogen oxides in subsection (a) of this
Section is met when the annual average concentration in a calendar year is less
than or equal to 53 ppb, as determined in accordance with appendix S of 40 CFR
50, incorporated by reference in Section 243.108, for the annual
standard.
f) The 2010 one-hour
primary NAAQS for nitrogen oxides in subsection (b) of this Section is met when
the three-year average of the annual 98th percentile
of the daily maximum one-hour average concentration is less than or equal to
100 ppb, as determined in accordance with appendix S of 40 CFR 50, incorporated
by reference in Section 243.108, for the 1-hour standard.
g) The 1971 secondary annual average NAAQS
for nitrogen oxides in subsection (c) of this Section is attained when the
annual arithmetic mean concentration in a calendar year is less than or equal
to 0.053 ppm, rounded to three decimal places (fractional parts equal to or
greater than 0.0005 ppm must be rounded up). To demonstrate attainment, an
annual mean must be based upon hourly data that are at least 75 percent
complete or upon data derived from manual methods that are at least 75 percent
complete for the scheduled sampling days in each calendar quarter.
Notes
Amended at 37 Ill. Reg. 12882, effective July 29, 2013
BOARD NOTE: Derived from 40 CFR 50.11.
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