OAR 340-202-0080
Ambient Air Quality Standards: Carbon Monoxide

For comparison to the standard, averaged ambient concentrations of carbon monoxide must be rounded to the nearest integer in parts per million (ppm). Fractional parts of 0.5 or greater must be rounded up. Concentrations of carbon monoxide in ambient air as measured by an approved method, must not exceed:

(1)

9 ppm as an eight-hour average concentration more than once per year at any site.

(2)

35 ppm as a one-hour average concentration more than once per year at any site.
NOTE: This rule is included in the State of Oregon Clean Air Act Implementation Plan that EQC adopted under OAR 340-200-0040 (State of Oregon Clean Air Act Implementation Plan)

Source: Rule 340-202-0080 — Ambient Air Quality Standards: Carbon Monoxide, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-202-0080.

Last Updated

Jun. 8, 2021

Rule 340-202-0080’s source at or​.us