An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Oklahoma SIP: OAC 252:100 Appendix E. Primary Ambient Air Quality Standards, SIP effective 2000-01-03 to 2009-02-26

Regulatory Text:
APPENDIX E.  PRIMARY AMBIENT AIR QUALITY STANDARDS
(Cited in Subchapter 3)

(As approved by EPA 11/03/1999 (64 FR 59629) at 52.1920(c)(48) effective 01/03/2000.)
 

Primary
Standards
Annual 1 Hour Max. 3 Hour Max. 8 Hour Max. 24 Hour Max. Calendar Quarter
Sulfur
Oxides
(Sulfur
Dioxide)
(1)
80 ug/m3
(0.14 ppm)
- - - (2)
365
ug/m3 (0.14 ppm)
-
PM-10 (3)
50 ug/m3
- - - 150
ug/m3 
-
Carbon
Monoxide
- (2)
40 mg/m3
(35 ppm)
- (2)
10 mg/m3 (9 ppm)
- -
Photo-
chemical
Oxidants
(Ozone)
- (5)
235 ug/m3
(0.12 ppm)
- - - -
Non-
methane
Hydro-
carbons
- - (2)(4)(6)
160 ug/m3
(0.24 ppm)
- - -
Nitrogen
Oxides
(Nitrogen
Dioxide)
(1)
100 ug/m3
(0.05 ppm)
- - - - -
Lead - - - - - (7)
1.5
ug/m3

     
     (1)  Annual arithmetic mean.
     (2)  Not to be exceeded more than once per year.
     (3)  The standard is attained when the expected arithmetic mean concentration is equal to or less than the numerical standard as determined by Appendix K Part 50 CFR 40.
     (4)  Measured between 6 a.m. and 9 a.m.
     (5)  The standard is attained when the expected number of days per calendar year with maximum hourly average concentrations above 0.l2 parts per million is equal to or less than l, as determined by Appendix H for Part 50 of Chapter I, CFR 40.
     (6)  Guide only value to EPA, to be used in planning, not a Federal standard.
     (7)  Maximum arithmetic mean averaged over a calendar quarter.