Section 173-476-180. Reference conditions.

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(1) All measurements of air quality that are expressed as mass per unit volume µg/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.

[Statutory Authority: Chapter 70.94 RCW. WSR 13-24-010 (Order 12-05), § 173-476-180, filed 11/21/13, effective 12/22/13.]

Chapter 70.94 RCW. WSR 13-24-010 (Order 12-05), § 173-476-180, filed 11/21/13, effective 12/22/13.

                    
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