Virginia Regulatory Town Hall
Department of Environmental Quality
Air Pollution Control Board
Ambient Air Quality Standards [9 VAC 5 ‑ 30]
Action is Exempt from Article 2 of the Administrative Process Act
Ambient Air Quality Standards (Rev. B13)
Action 3924
General Information
Action Summary On January 15, 2013 (78 FR 3086), EPA revised the National Ambient Air Quality Standard (NAAQS) for PM2.5 (particles in the ambient air with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers). The primary standard has been revised several times since it was originally set at 15 micrograms per cubic meter (µg/m3) in 1997. Phase-out of the PM10 standard occurred July 30, 2004 (69 FR 45595), and a new 24-hour standard was added October 17, 2006 (71 FR 61224). Under this most recent revision, the annual arithmetic mean concentration has been set at 12 µg/m3, and the standard for the 24-hour concentration is being retained at 35 µg/m3. Chapter 30 contains the specific criteria pollutant standards set out in 40 CFR Part 50. Therefore, this chapter is the action effectively implementing the EPA requirements.
Chapters Affected Only affects this chapter.
Executive Branch Review This Action is exempt from Article 2 of the Administrative Process Act. The normal executive branch review process is not required. As such, it can be submitted directly for publication and is effective upon publication.
Exempt Citation: 2.2-4006 A 4 c
RIS Project Yes  [003550]
New Periodic Review This action will not be used to conduct a new periodic review.
Stages associated with this regulatory action.
Stage ID Stage Type Status
6508 Final Stage complete. This regulation became effective on 05/22/2013.
Contact Information
Name / Title: Mary E. Major 
Address: 629 East Main Street
P.O. Box 1105
Richmond, VA 23218
Email Address:
Phone: (804)698-4423    FAX: (804)698-4510    TDD: (804)698-4021