| Oklahoma Department of Environmental Quality | ||||||
| 2025 NO2 | ||||||
| 8th Highest One Hour Daily Maximum (ppb) through March 11, 2025 | ||||||
| Standard: 3-year average of the 98th percentile of 1-hour data shall not exceed 100 ppb | ||||||
| Site | 98th Percentile (ppb) | 3-yr Avg. | ||||
| 2022 | 2023 | 2024 | 2025* | 22-24 | 23-25* | |
| OKC Near Road | 44.0 | 41.0 | 40.0 | 40.0 | 41.7 | 40.3 |
| OKC North | 38.0 | 29.0 | 27.0 | 28.0 | 31.3 | 28.0 |
| Tulsa Central | 39.1 | 32.7 | 29.5 | 28.7 | 33.8 | 30.3 |
| 8th Highs are considered 98th percentile until end of year data completeness is calculated. | ||||||
| *All data is subject to change upon QA/QC -- data collection for 2025 is ongoing. | ||||||