The department shall determine attainment of the primary standards for CO specified in Env-A 305.01 as follows:
- (a) The 8-hour primary ambient air quality standard for CO shall be deemed to be attained when the 8-hour average concentration exceeds 9 ppm not more than once per calendar year; and
- (b) The 1-hour primary ambient air quality standard for CO shall be deemed to be attained when the 1-hour average concentration exceeds 35 ppm not more than once per calendar year.
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