Oklahoma Department of Environmental Quality
2018 2023 OKLAHOMA Carbon Monoxide
 8-Hour Daily Maximums through December 28, 2023
Site  2018 2019 2020 2021 2022 2023
  1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd 1st 2nd
Tulsa Central 1.1 1.0 0.9 0.8 1.0 0.9 0.9 0.8 1.0 0.8 1.0 1.0
Site 1127 9-Jan 16-Dec 5-Dec 8-Jan 10-Dec 17-Nov 4-Jan 3-Jan 30-Jan 17-Jan 2-Jan 19-Jun
                         
OKC North 0.9 0.8 0.7 0.7 2.1 1.4 1.1 1.1 0.7 0.7 0.9 0.9
Site 1037 10-Dec 11-Dec 15-Nov 24-Nov 30-Oct 30-Oct 15-Aug 16-Aug 8-Feb 9-Mar 28-Nov 17-Dec
                         
OKC Near Road 1.6 1.6 1.1 1.0 1.4 1.4 1.3 1.3 1.5 1.3 1.2 1.2
Site 0097 4-Jan 29-Nov 9-Jan 5-Jan 11-Jul 17-Jul 23-Feb 31-Oct 29-Jan 24-Jan 6-Jan 17-Dec