OAR 340-202-0070
Ambient Air Quality Standards: Sulfur Dioxide

Concentrations of sulfur dioxide in ambient air as measured by an approved method for each averaging time must not exceed the following concentrations:

(1)

Annual average: 0.02 ppm as an annual arithmetic mean for any calendar year at any site as measured by the reference method described in appendix A of 40 CFR part 50 or by an equivalent method designated in accordance with 40 CFR part 53.

(2)

24-hour average: 0.10 ppm as a 24-hour average concentration more than once per calendar year at any site as measured by the reference method described in appendix A of 40 CFR part 50 or by an equivalent method designated in accordance with 40 CFR part 53.

(3)

3-hour average: 0.50 ppm as a three-hour average concentration more than once per calendar year at any site as measured by the reference method described in appendix A of 40 CFR part 50.

(4)

1-hour average: 0.075 ppm as a three-year average of the annual 99th percentile of the daily maximum 1-hour average concentration recorded at any monitoring site as determined by appendix T of 40 CFR part 50 as measured by a reference method based on appendix A or A-1 of 40 CFR part 50, or by a Federal Equivalent Method (FEM) designated in accordance with 40 CFR part 53.
[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 referenced EPA Methods by clicking on “Tables” link below.]
[ED. NOTE: To view attachments referenced in rule text, click here to view rule.]

Source: Rule 340-202-0070 — Ambient Air Quality Standards: Sulfur Dioxide, https://secure.­sos.­state.­or.­us/oard/view.­action?ruleNumber=340-202-0070.

Last Updated

Jun. 8, 2021

Rule 340-202-0070’s source at or​.us