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 |
Disclaimer: These regulations may not be the most recent version. Washington may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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