Oklahoma Department of Environmental Quality
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2015 2020 OKLAHOMA Carbon Monoxide
Highest 8 Hour Averages (ppm) through December 31, 2020
Site  2015 2016 2017 2018 2019 2020
  1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd
Tulsa Central 1.2 1.1 1.9 1.6 1.0 1.0 1.1 1.0 0.9 0.8 1.0 0.9
Site 1127 20-Jan 27-Jan 22-Jul 22-Jul 2-Jan 11-Jan 9-Jan 16-Dec 5-Dec 8-Jan 10-Dec 9-Dec
                         
OKC North 2.0 0.9 0.9 0.9 0.8 0.8 0.9 0.8 0.7 0.7 2.1 1.0
Site 1037 3-Mar 3-Mar 14-Jan 27-Jan 7-Jan 10-Jan 10-Dec 11-Dec 15-Nov 24-Nov 30-Oct 20-Dec
                         
OKC Near Road 1.1 0.9 1.1 1.1 1.3 1.3 1.6 1.6 1.1 1.0 1.4 1.4
Site 097 4-Dec 28-Aug 15-Nov 26-Nov 11-Jan 10-Dec 4-Jan 29-Nov 9-Jan 5-Jan 11-Jul 17-Jul