R18-2-203. Ozone

A. The eight-hour average primary ambient air quality standard for ozone is 0.070 ppm. B. The eight-hour average secondary ambient air quality standard for ozone is 0.070 ppm. C. To determine attainment of the primary and secondary standards, a person shall measure ozone in the ambient air by: 1. A reference method based on 40 CFR 50, Appendix D, and designated according to 40 CFR 53; or 2. An equivalent method designated according to 40 CFR 53. D. The eight-hour average primary ambient air quality standard for ozone is met at an ambient air quality monitoring site when the three-year average of the annual fourth highest daily maximum eight-hour average ozone concentration is less than or equal to 0.070 ppm, determined according to 40 CFR 50, Appendix U.