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 (PM 2.5 ) standards contained in 9VAC5-30-65 , 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 PM 2.5 for purposes of comparison to the standards contained in 9VAC5-30-65 , 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.