Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-476 - Ambient air quality standards
Section 173-476-110 - Ambient air quality standards for PM-2.5
Universal Citation: WA Admin Code 173-476-110
Current through Register Vol. 24-06, March 15, 2024
(1) Standards for PM-2.5.
(a) The three-year average of the annual
arithmetic mean concentration of PM-2.5 must not exceed 12.0
[MICRO]g/m3.
(b) The three-year average of the
ninety-eighth percentile twenty-four-hour average concentration of PM-2.5 must
not exceed 35
[MICRO]g/m3.
(2) Measurement method. The levels of PM-2.5 in the ambient air must be measured by:
(a) A FRM based on 40 C.F.R. Part 50,
Appendix L and designated according to 40 C.F.R. Part 53; or
(b) A FEM designated according to 40 C.F.R.
Part 53.
(3) Interpretation method. The interpretation method found in 40 C.F.R. Part 50, Appendix N must be used.
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