Ill. Admin. Code tit. 35, § 243.123 - Carbon Monoxide
a) The 1971
eight-hour and one-hour primary NAAQS for carbon monoxide are as follows:
1) An eight-hour average concentration of 9
ppm (10 mg/m3), not to be exceeded more than once
per year; and
2) A one-hour average
concentration of 35 ppm (40 mg/m3), not to be
exceeded more than once per year.
b) The levels of carbon monoxide in the
ambient air must be measured by a method that fulfills either of the following
requirements:
1) An FRM based on appendix C
of 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) An FEM designated by USEPA and listed in
the List of Designated Methods, incorporated by reference in Section
243.108.
c) An eight-hour
average concentration must be considered valid if at least 75 percent of the
hourly average for the eight-hour period is available. In the event that only
six-hour (or seven-hour) averages are available, the eight-hour average must be
computed on the basis of the hours available using six (or seven) as the
divisor.
d) When summarizing data
for comparison with the standards, averages must be stated to one decimal
place. Comparison of the data with the levels of the standards in ppm must be
made in terms of integers with fractional parts of 0.5 or greater rounded
up.
Notes
Amended at 37 Ill. Reg. 12882, effective July 29, 2013
BOARD NOTE: Derived from 40 CFR 50.8.
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