Wash. Admin. Code Northwest Clean Air Agency, 400, 403 - PARTICULATE STANDARDS (PM[2.5])
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.
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.