Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-476 - Ambient air quality standards
Section 173-476-180 - Reference conditions
Universal Citation: WA Admin Code 173-476-180
Current through Register Vol. 24-06, March 15, 2024
(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.
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