Section 50. Ozone (1-hour)

A. The primary and secondary ambient air quality standard is 0.12 parts per million (235 micrograms per cubic meter).

B. Ozone shall be measured by the reference method described in Appendix D of 40 CFR Part 50, other method designated as such, or by an equivalent method.

C. The standard is attained when the expected number of days per calendar year with maximum hourly average concentrations above 0.12 parts per million (235 micrograms per cubic meter) is equal to or less than one, as determined by Appendix H of 40 CFR Part 50.

D. The 1-hour ozone ambient air quality standard set forth in subsection A of this section shall no longer apply to an area after June 15, 2005.

Historical Notes

Derived from VR120-03-05, eff. January 1, 1985; amended, Volume 20, Issue 24, eff. September 8, 2004.

Statutory Authority

§ 10.1-1308 of the Code of Virginia; §§ 108, 109 and 302 of the Clean Air Act; 40 CFR Parts 50, 53 and 58.