The primary and secondary ambient air quality standards for nitrogen dioxide (NO2), CAS # 10102-44-0, shall be as follows:
- (a) The annual primary ambient air quality standard for NO2 shall be 53 ppb, annual average concentration;
- (b) The 1-hour primary ambient air quality standard for NO2 shall be 100 ppb, 1-hour average concentration; and
- (c) The secondary ambient air quality standard for NO2 shall be 0.053 ppm, equivalent to 100 μg/m3, annual arithmetic mean concentration.
Source. #6227, eff 4-25-96; ss by #8054, eff 2-28-04; ss by #10173, eff 9-1-12; ss by #13382, eff 5-25-22