Virginia Regulatory Town Hall

Final Text

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Action:
Ambient Air Quality Standards (Rev. B13)
Stage: Final
 
9VAC5-30-15

9VAC5-30-15. Reference conditions.

All measurements of air quality that are expressed as mass per unit volume (e.g., micrograms per cubic meter) other than for the particulate matter (PM2.5) standards contained in 9VAC5-30-65 and, 9VAC5-30-66, and 9VAC5-30-67, and lead standards contained in 9VAC5-30-80 shall be corrected to a reference temperature of 25°C and a reference pressure of 760 millimeters of mercury (1,013.2 millibars). Measurements of PM2.5 for purposes of comparison to the standards contained in 9VAC5-30-65 and, 9VAC5-30-66, and 9VAC5-30-67 and of lead for purposes of comparison to the standards contained in 9VAC5-30-80 shall be reported based on actual ambient air volume measured at the actual ambient temperature and pressure at the monitoring site during the measurement period.

9VAC5-30-67

9VAC5-30-67. Particulate matter (PM2.5).

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

1. 12.0 micrograms per cubic meter, annual arithmetic mean concentration.

2. 35 micrograms per cubic meter, 24-hour average concentration.

B. The secondary ambient air quality standards for particulate matter are:

1. 15.0 micrograms per cubic meter annual arithmetic mean concentration.

2. 35 micrograms per cubic meter 24-hour average concentration.

C. 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 the reference method based on Appendix L of 40 CFR Part 50, or other method designated as such, or by equivalent method.

D. The annual primary PM2.5 standard is 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 12.0 micrograms per cubic meter.

E. The annual secondary PM2.5 standard is 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.

F. 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 35 micrograms per cubic meter.

G. The PM2.5 standards set forth in this section were established by EPA on January 15, 2013 (78 FR 3086), and became effective in the Commonwealth on March 13, 2013, by adoption by the board. The PM2.5 standards set forth in this section shall apply for purposes of the following:

1. Control strategy implementation plan revisions, maintenance plans, and associated emissions budgets relative to the PM2.5 standards in this section.

2. Designation of nonattainment areas and maintenance areas relative to the PM2.5 standards in this section.

3. Implementation of the new source review programs set forth in Part II (9VAC5-80-50 et seq.) of 9VAC5-80 (Permits for Stationary Sources).

Nothing in this section shall prevent the redesignation of any nonattainment area to attainment at any time.