Ariz. Admin. Code § R18-2-205 - Nitrogen Oxides (nitrogen Dioxide)
A. The primary ambient air quality standards
for oxides of nitrogen, measured in the ambient air as nitrogen dioxide, are:
1. 53 parts per billion - annual average
concentration.
2. 100 parts per
billion - one-hour average concentration.
B. The secondary ambient air quality standard
for nitrogen dioxide is 0.053 (parts per million (100 micrograms per cubic
meter) -- annual arithmetic mean.
C. The levels of the standards shall be
measured by a reference method based on 40 CFR 50, Appendix F or a federal
equivalent method designated in accordance with 40 CFR 53.
D. The annual primary standard is met when
the annual average concentration in a calendar year is less than or equal to 53
ppb, as determined in accordance with 40 CFR, Appendix S for the annual
standard.
E. The one-hour primary
standard 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
parts per billion, as determined in accordance with 40 CFR 50, Appendix
S.
F. The secondary standard 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, with
fractional parts equal to or greater than 0.0005 ppm rounded up. To demonstrate
attainment, an annual mean shall be based upon hourly data that is at least 75%
complete or upon data derived from the manual methods, that is at least 75%
complete for the scheduled sampling days in each calendar quarter.
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.