Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-476 - Ambient air quality standards
Section 173-476-900 - Table of standards

Universal Citation: WA Admin Code 173-476-900
Current through Register Vol. 24-06, March 15, 2024

Disclaimer: This table is provided as an overview. See complete rule for more detail.

Pollutant Averaging Time Level Remarks Measurement Method Interpretation Method
Particle Pollution PM-10 24-hour 150 [MU]g/m3 Not to be exceeded more than once per year averaged over 3 years 40 C.F.R. Part 50, Appendix J 40 C.F.R. Part 50, Appendix K
PM-2.5 Annual 12.0 [MU]g/m3 Annual mean, averaged over 3 years 40 C.F.R. Part 50, Appendix L 40 C.F.R. Part 50, Appendix N
24-hour 35 [MU]g/m3 98th percentile, averaged over 3 years
Lead Rolling 3-month average 0.15 [MICRO]g/m3 Not to be exceeded 40 C.F.R. Part 50, Appendix G 40 C.F.R. Part 50, Appendix R
Sulfur Dioxide Annual 0.02 ppmv Not to be exceeded in a calendar year 40 C.F.R. Part 50, Appendix A-1 or A-2 WAC 173-476-130(3)
24-hour 0.14 ppmv Not to be exceeded more than once per year
3-hour 0.5 ppmv Not to be exceeded more than once per year
1-hour 75 ppbv 99th percentile of 1hour daily maximum concentrations, averaged over 3 years
Nitrogen Dioxide Annual 53 ppbv Annual Mean 40 C.F.R. Part 50, Appendix F 40 C.F.R. Part 50, Appendix S
1-hour 100 ppbv 98th percentile of 1hour daily maximum concentrations, averaged over 3 years
Ozone 8-hour 0.070 ppmv Annual fourth-highest daily maximum 8-hr concentration, averaged over 3 years 40 C.F.R. Part 50, Appendix D 40 C.F.R. Part 50, Appendix U
Carbon Monoxide 8-hour 9 ppmv Not to be exceeded more than once per year 40 C.F.R. Part 50, Appendix C WAC 173-476-160(3)
1-hour 35 ppmv

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