| Oklahoma Department of Environmental Quality | ||||||||||||||||
| NO2 through December 31, 2022 | ||||||||||||||||
| One hour daily maximum (ppb) | ||||||||||||||||
| Site | 2019 | 2020 | 2021 | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 19-21 Avg | 20-22 Avg | 2022 | ||
| 98th % | 98th % | 98th % | (date) | (date) | (date) | (date) | (date) | (date) | (date) | (date) | 98% | 98% | Critical Value | |||
| OKC Near Road (097) | 52.0 | 51.0 | 49.0 | 47.0 | 47.0 | 46.0 | 46.0 | 45.0 | 43.0 | 45.0 | 213.0 | |||||
| 39.0 | 43.0 | 47.0 | 18-Jan | 28-Sep | 31-Jan | 2-Mar | 3-Mar | 13-Feb | 2-Mar | 18-Jan | ||||||
| OKC North (1037) | 43.0 | 40.0 | 39.0 | 39.0 | 39.0 | 37.0 | 37.0 | 36.0 | 39.3 | 38.7 | 223.0 | |||||
| 38.0 | 36.0 | 44.0 | 27-Feb | 31-Jan | 23-Jan | 24-Jan | 12-Jan | 10-Jan | 24-Jan | 17-Jan | ||||||
| Tulsa Central (1127) | 45.3 | 44.0 | 43.7 | 40.3 | 39.3 | 39.1 | 36.9 | 36.5 | 37.3 | 37.3 | 227.5 | |||||
| 36.3 | 35.0 | 40.5 | 1-Mar | 3-Mar | 14-Feb | 28-Feb | 9-Feb | 18-Jan | 29-Jan | 18-Jan | ||||||
| 8th Highs are considered 98th percentile until end of year data completeness can be calculated. | ||||||||||||||||