Oklahoma Department of Environmental Quality
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2016 2021 OKLAHOMA Carbon Monoxide
Highest 8 Hour Averages (ppm) through October 20, 2021
Site  2016 2017 2018 2019 2020 2021
  1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd
Tulsa Central 1.9 1.6 1.0 1.0 1.1 1.0 0.9 0.8 1.0 0.9 0.9 0.8
Site 1127 22-Jul 22-Jul 2-Jan 11-Jan 9-Jan 16-Dec 5-Dec 8-Jan 10-Dec 17-Nov 4-Jan 3-Jan
                         
OKC North 0.9 0.9 0.8 0.8 0.9 0.8 0.7 0.7 2.1 1.4 1.1 1.1
Site 1037 14-Jan 27-Jan 7-Jan 10-Jan 10-Dec 11-Dec 15-Nov 24-Nov 30-Oct 30-Oct 15-Aug 16-Aug
                         
OKC Near Road 1.1 1.1 1.3 1.3 1.6 1.6 1.1 1.0 1.4 1.4 1.3 1.1
Site 0097 15-Nov 26-Nov 11-Jan 10-Dec 4-Jan 29-Nov 9-Jan 5-Jan 11-Jul 17-Jul 23-Feb 5-Jan