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

Edition: Current OARD snapshotEffective: 2019-05-16Last verified: 2026-09-07

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.] [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.]

Official history and status

Statutory/Other Authority: ORS 468 & 468A

Statutes/Other Implemented: ORS 468A.025

History: DEQ 13-2019, amend filed 05/16/2019, effective 05/16/2019 DEQ 7-2017, f. & cert. ef. 7-13-17 DEQ 5-2010, f. & cert. ef. 5-21-10 DEQ 3-2007, f. & cert. ef. 4-12-07 DEQ 6-2001, f. 6-18-01, cert. ef. 7-1-01 DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0030 DEQ 4-1993, f. & cert. ef. 3-10-93 DEQ 24-1991, f. & cert. ef. 11-13-91 DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88) DEQ 4-1982, f. & ef. 1-29-82 DEQ 7-1980, f. & ef. 3-5-80 DEQ 15-1979, f. & ef. 6-22-79 DEQ 37, f. 2-15-72, ef. 3-1-72

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Official source: https://secure.sos.state.or.us/oard/