Rule 17.8.213 - AMBIENT AIR QUALITY STANDARD FOR OZONE(1) No person shall cause or contribute to concentrations of ozone in the ambient air which exceed the following standard: (a) hourly average: 0.10 ppm one-hour average, not to be exceeded more than once per year.(2) For determining compliance with this rule, ozone shall be measured by the chemiluminescence method, as more fully described in 40 CFR Part 50, Appendix D, incorporated by reference in ARM 17.8.202, or by an approved equivalent method.NEW, 1980 MAR p. 2399, Eff. 8/15/80; AMD, 1996 MAR p. 1844, Eff. 7/4/96; TRANS, from DHES, 1996 MAR p. 2285.75-2-111, 75-2-202, MCA; IMP, 75-2-202, MCA;