Washington Administrative Code
Title - Northwest Clean Air Agency
400 - STANDARDS
Sec2 403 - PARTICULATE STANDARDS (PM[2.5])
Universal Citation: WA Admin Code 403
Current through Register Vol. 24-18, September 15, 2024
403.1 The concentration in the ambient air of particulate matter with an aerodynamic diameter of less than two point five (2.5) microns (PM2.5) shall not exceed:
(A) Sixty five (65) micrograms per cubic
meter of air as a 24 hour average based on the 3-year average of the 98th
percentile of 24-hour PM2.5 concentrations.
(B) Fifteen (15) micrograms per cubic meter
of air as an annual arithmetic mean based on the 3-year average of the annual
arithmetic mean PM2.5 concentrations.
403.2 Sampling and analysis for particulates shall be conducted in accordance with Appendix A of this Regulation.
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