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.]
[NOTE: View a PDF of referenced EPA Methods by clicking on
"Tables" link below.]
Notes
Or. Admin. Code
§
340-202-0070
DEQ 37, f. 2-15-72, ef.
3-1-72; DEQ 8-1988, f. & cert. ef. 5-19-88 (corrected 9-30-88); DEQ
24-1991, f. & cert. ef. 11-13-91; DEQ 4-1993, f. & cert. ef. 3-10-93;
DEQ 14-1999, f. & cert. ef. 10-14-99, Renumbered from 340-031-0020; DEQ
6-2001, f. 6-18-01, cert. ef. 7-1-01; DEQ 11-2013, f. & cert. ef. 11-7-13;
DEQ
7-2015, f. & cert. ef.
4/16/2015;
DEQ
13-2019, amend filed 05/16/2019, effective
5/16/2019
Statutory/Other Authority: ORS
468.020 & 468A
Statutes/Other Implemented: ORS
468A.025 &
468A.035
