Washington Administrative Code
Title - Northwest Clean Air Agency
400 - STANDARDS
Sec2 420 - CARBON MONOXIDE STANDARDS
Universal Citation: WA Admin Code 420
Current through Register Vol. 24-18, September 15, 2024
420.1 Carbon monoxide measured at an ambient air monitoring station shall not exceed:
420.11 10 milligrams per cubic meter (9.0
ppm) eight (8) hour average concentration more than once per year at any
location where people would be exposed to such concentration for eight (8)
hours or more.
420.12 40 milligrams
per cubic meter (35.0 ppm) one (1) hour average concentration more than once
per year.
420.2 Sampling and analysis to determine compliance with this Section shall be as outlined in Section 180 or equivalent as determined by the Control Officer.
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