Oklahoma Department of Environmental Quality
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2020 OKLAHOMA SO2
Highest 1 Hour Daily Highs (ppb) through December 31, 2020
   
Site          2020 Daily Max 1-hr Values   3 Year Avg of 99th Percentile
2017 2018 2019 1st 2nd 3rd 4th* 17-19 Avg 18-20 Avg 2020
99th % 99th %  99th % (date) (date)  (date)  (date) 99th % 99th % Critical Value
  Ponca City  (604)   26.0 24.0 23.0 23.0 28 26 174
29.0 31.0 23.0 8-Nov 7-Nov 1-Mar 4-Nov      
  OKC North (1037) 2.0 2.0 2.0 2.0 2.0 2.0 224
2.0 3.0 1.0 26-Jan 28-Feb 8-Apr 28-Sep    
  Tulsa Newblock  (175) 9.0 7.0 7.0 7.0 9 7 215
14.0 8.0 5.0 8-Dec 9-Jan 15-Feb 22-Dec      
  Tulsa TCWD (235) 8.0 7.0 6.0 5.0 9 6 216
14.0 6.0 6.0 29-Feb 23-Jun 26-Aug 29-Apr    
  Tulsa Central (1127) 3.5 2.7 2.0 1.8 3 3 222
3.8 3.3 2.6 27-Jan 21-Dec 8-Mar 17-Sep      
  Tulsa Riverside (179) 7.0 5.0 3.0 3.0 5 4 218
6.0 4.0 6.0 9-Jan 8-Mar 8-Jan 27-Jan    
  Oxbow/Kremlin (555) 53.0 36.0 33.0 32.0 47 40 140
54.0 43.0 45.0 14-Oct 13-Mar 6-May 6-Oct      
  Fort Gibson (170) 19.0 13.0 11.0 11.0 30 16 190
52.0 31.0 7.0 11-Jun 15-Jun 13-Jun 14-Jun    
  Pryor (188)   19.0 19.0 17.0 15.0 22 19 187
25.0 25.0 16.0 27-Apr 8-Aug 2-Feb 21-Apr      
* 4th Highs are considered 99th percentile until end of year data completeness can be calculated.