OAR 340-202-0090
Ambient Air Quality Standards: Ozone

Concentrations of ozone in ambient air as measured by an approved method must not exceed 0.070 ppm as a daily maximum eight-hour average concentration. This standard is attained when, at any site the average of the annual fourth-highest daily maximum eight-hour average ozone concentration is equal to or less than 0.070 ppm as determined by the method of Appendix I, 40 C.F.R. 50.
[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).]
[NOTE: View a PDF of Appendix I by clicking on “Tables” link below.]
[ED. NOTE: To view attachments referenced in rule text, click here to view rule.]

Source: Rule 340-202-0090 — Ambient Air Quality Standards: Ozone, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-202-0090.

Last Updated

Jun. 8, 2021

Rule 340-202-0090’s source at or​.us