WAC 173-476-900:

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PDFWAC 173-476-900

Table of standards.

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 μg/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 μg/m3	Annual mean, averaged over 3 years	40 C.F.R. Part 50, Appendix L	40 C.F.R. Part 50, Appendix N
	PM-2.5	24-hour	35 μg/m3	98th percentile, averaged over 3 years	40 C.F.R. Part 50, Appendix L	40 C.F.R. Part 50, Appendix N
Lead		Rolling 3-month average	0.15 µg/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 1-hour 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
Nitrogen Dioxide		1-hour	100 ppbv	98th percentile of 1-hour daily maximum concentrations, averaged over 3 years	40 C.F.R. Part 50, Appendix F	40 C.F.R. Part 50, Appendix S
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)
Carbon Monoxide		1-hour	35 ppmv	Not to be exceeded more than once per year	40 C.F.R. Part 50, Appendix C	WAC 173-476-160(3)

[Statutory Authority: RCW 70.94.152, 70.94.331, 70.94.860. WSR 16-12-099 (Order 16-01), § 173-476-900, filed 5/31/16, effective 7/1/16. Statutory Authority: Chapter 70.94 RCW. WSR 13-24-010 (Order 12-05), § 173-476-900, filed 11/21/13, effective 12/22/13.]