Washington Administrative Code
Title - Northwest Clean Air Agency
400 - STANDARDS
Sec2 401 - SUSPENDED PARTICULATE STANDARDS (PM[10])
Universal Citation: WA Admin Code 401
Current through Register Vol. 24-18, September 15, 2024
401.1 The concentration in the ambient air of particulate matter with an aerodynamic diameter of less than ten (10) micrometers (PM10) shall not exceed:
401.11 One hundred and fifty
(150) micrograms per cubic meter of air as a 24 hour average more than once a
year.
401.12 Fifty (50) micrograms
per cubic meter of air as an annual arithmetic mean.
401.2 Sampling and analysis for suspended particulates shall be conducted according to the method outlined in Section 180.
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