Section 173-476-180 - Reference conditions(1) All measurements of air quality that are expressed as mass per unit volume [MICRO]g/m3 must be corrected to: (a) A reference temperature of 25°C; and(b) A reference pressure of 760 millimeters of mercury (1,013.2 millibars (hectopascals)).(2)Exception for measurements of PM-2.5 and lead. Measurements of PM-2.5 and lead must be reported based on the actual ambient air volume measured at the actual ambient temperature and pressure at the monitoring site during the measurement period.Wash. Admin. Code § 173-476-180
Adopted by WSR 13-24-010 (Order 12-05), filed 11/21/13, effective 12/22/2013