9VAC5-20-204. Nonattainment areas.

A. Nonattainment areas are geographically defined below by locality for the criteria pollutants indicated. Following the name of each ozone nonattainment area, in parentheses, is the classification assigned pursuant to § 181(a) of the federal Clean Air Act (42 USC § 7511(a)) and, 40 CFR 51.903(a), and 40 CFR 51.1103(a).

1. Ozone (1-hour).

Northern Virginia Ozone Nonattainment Area (severe).

2. Ozone (8-hour, 0.08 ppm).

Northern Virginia Ozone Nonattainment Area (moderate).

3. Ozone (8-hour, 0.075 ppm)

Northern Virginia Ozone Nonattainment Area (marginal).

4. PM_2.5 (particles with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers).

Northern Virginia PM_2.5 Nonattainment Area.

4. 5. All other pollutants.

None.

B. Subdivision A 1 of this section shall not be effective after June 15, 2005.

9VAC5-30-55. Ozone (8-hour, 0.08 ppm).

A. The primary and secondary ambient air quality standard is 0.08 parts per million, daily maximum 8-hour average.

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

C. The 8-hour primary and secondary ozone ambient air quality standards are met at an ambient air quality monitoring site when the average of the annual fourth-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.08 ppm, as determined in accordance with Appendix I of 40 CFR Part 50.

D. The standard set forth in subsection A of this section shall no longer apply to an area for transportation conformity purposes after July 20, 2013. The standard set forth in subsection A of this section shall continue to remain applicable to all areas for all other purposes notwithstanding the standard set forth in 9VAC5-30-56 A or the designation of areas for the standard set forth in 9VAC5-30-56 A 3. Area designations and classifications with respect to the standard set forth in subsection A of this section are set forth in 9VAC5-20-204 A 2.