Oklahoma Department of Environmental Quality
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2021 OKLAHOMA SO2
Highest 1 Hour Daily Highs (ppb) through October 20, 2021
   
Site          2021 Daily Max 1-hr Values   3 Year Avg of 99th Percentile
2018 2019 2020 1st 2nd 3rd 4th* 18-20 Avg 19-21 Avg 2021
99th % 99th %  99th % (date) (date)  (date)  (date) 99th % 99th % Critical Value
  Ponca City  (604)   27.0 27.0 26.0 26.0 26 24 182
31.0 23.0 23.0 9-Mar 23-Jun 4-Feb 10-Mar      
  OKC North (1037) 2.0 1.0 1.0 1.0 2.0 1.3 225
3.0 1.0 2.0 1-Mar 19-Jul 6-Feb 7-Mar    
  Tulsa Newblock  (175) 10.0 6.0 5.0 4.0 7 5 216
8.0 5.0 7.0 2-Jan 26-Sep 26-Apr 25-Apr      
  Tulsa TCWD (235) 7.0 7.0 6.0 4.0 6 5 217
6.0 6.0 5.0 30-Mar 14-Jun 29-Mar 15-Jun    
  Tulsa Central (1127) 3.6 2.3 2.2 2.1 3 2 224
3.3 2.6 1.7 10-Sep 20-Jul 25-Feb 20-Mar      
  Tulsa Riverside (179) closed 4 5 219
4.0 6.0 3.0    
  Oxbow/Kremlin (555) 48.0 46.0 44.0 24.0 40 34 151
43.0 45.0 32.0 8-Sep 25-Feb 15-Sep 28-May      
  Fort Gibson (170) closed 16 9 210
31.0 7.0 11.0    
  Pryor (188)   closed 19 16 197
25.0 16.0 15.0      
* 4th Highs are considered 99th percentile until end of year data completeness can be calculated.