Oregon Administrative Rules
Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY
Division 202 - AMBIENT AIR QUALITY STANDARDS AND PREVENTION OF SIGNIFICANT DETERIORATION INCREMENTS
Section 340-202-0080 - Carbon Monoxide
Current through Register Vol. 63, No. 3, March 1, 2024
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 as adopted by the Environmental Quality Commission under OAR 340-200-0040.]
Stat. Auth.: ORS 468 & ORS 468A
Stats. Implemented: ORS 468A.025