Virginia Administrative Code
Title 9 - ENVIRONMENT
Agency 5 - STATE AIR POLLUTION CONTROL BOARD
Chapter 30 - AMBIENT AIR QUALITY STANDARDS
Section 9VAC5-30-65 - Particulate matter (PM2.5)

A. The primary and secondary ambient air quality standards for particulate matter are:

B. Particulate matter shall be measured in the ambient air as PM2.5 (particles with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers) by a reference method based on Appendix L of 40 CFR Part 50, or other method designated as such, or by an equivalent method.

C. The annual primary and secondary PM2.5 standards are met when the annual arithmetic mean concentration, as determined in accordance with Appendix N of 40 CFR Part 50, is less than or equal to 15.0 micrograms per cubic meter.

D. The 24-hour primary and secondary PM2.5 standards are met when the 98th percentile 24-hour concentration, as determined in accordance with Appendix N of 40 CFR Part 50, is less than or equal to 65 micrograms per cubic meter.

E. The PM2.5 standards set forth in this section were established by EPA on July 18, 1997 (62 FR 38652) and became effective on September 8, 2004, by adoption by the board. The PM2.5 standards set forth in this section shall continue to apply only for purposes of the following:

F. The primary annual standard set forth in subsection A of this section shall no longer apply as of October 24, 2016. The secondary annual standard and the 24-hour standard set forth in subsection A of this section shall remain in effect.

Article 9

Permits for Major Stationary Sources and Major Modifications Locating in Nonattainment Areas or the Ozone Transport Region