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Oklahoma Department of Environmental Quality
NO2 through October 21, 2021
One hour daily maximum (ppb)
                             
                             
Site 2018 2019 2020 1st 2nd 3rd 4th 5th 6th 7th 8th 18-20 Avg 19-21 Avg 2021
  98th % 98th % 98th % (date) (date) (date) (date) (date) (date) (date) (date) 98% 98% Critical Value
OKC Near Road (097)       49.0 49.0 48.0 47.0 44.0 42.0 42.0 40.0 40.7 40.7 221.0
  40.0 39.0 43.0 19-Feb 5-May 24-Sep 18-Feb 1-Jan 1-Feb 3-Mar 6-Mar      
OKC North (1037)   49.0 48.0 47.0 46.0 45.0 45.0 45.0 44.0 39.3 229.0
  (new in 2018) 38.0 36.0 19-Feb 19-Feb 19-Feb 19-Feb 19-Feb 19-Feb 19-Feb 19-Feb  
Tulsa Central (1127)       47.4 47.3 44.1 42.5 42.5 41.9 40.5 39.8 36.7 37.0 231.7
  38.9 36.3 35.0 19-Feb 19-Feb 19-Feb 20-Feb 2-Mar 3-Mar 18-Feb 20-Feb      
   8th Highs are considered 98th percentile until end of year data completeness can be calculated.