HTML has links - PDF has Authentication
173-476-170  <<  173-476-180 >>   173-476-900

PDFWAC 173-476-180

Reference conditions.

(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.]
Site Contents
Selected content listed in alphabetical order under each group