Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-476 - Ambient air quality standards
Section 173-476-140 - Ambient air quality standards for nitrogen oxides (nitrogen dioxide)
Universal Citation: WA Admin Code 173-476-140
Current through Register Vol. 24-06, March 15, 2024
(1) Standards for nitrogen oxides (measured as nitrogen dioxide).
(a) The annual average concentration for
nitrogen oxides in ambient air must not exceed 53 ppbv (100
[MICRO]g/m3) measured in the
ambient air as nitrogen dioxide.
(b) The three-year average of the
ninety-eighth percentile of the daily maximum one-hour average concentration of
nitrogen oxides must not exceed 100 ppbv, as measured in the ambient air as
nitrogen dioxide.
(2) Measurement method. The levels of nitrogen oxides must be measured as nitrogen dioxide by:
(a) A FRM based on 40
C.F.R. Part 50, Appendix F; 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 S must be followed.
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