| Oklahoma Department of Environmental Quality | ||||||
| 2026 NO2 | ||||||
| 8th Highest One Hour Daily Maximum through August 2026 | ||||||
| Standard: 3-year average of the 98th percentile of 1-hour data shall not exceed 100 ppb | ||||||
| Site | 98th Percentile (ppb) | 3-yr Avg. | ||||
| 2023 | 2024 | 2025 | 2026* | 23-25 | 24-26* | |
| OKC Near Road | 41.0 | 40.0 | 42.0 | 40.0 | 41.0 | 40.7 |
| OKC North | 29.0 | 27.0 | 30.0 | 35.0 | 28.7 | 30.7 |
| Tulsa Near Road | - | - | - | 34.1 | - | - |
| Tulsa Central | 32.7 | 29.5 | 30.4 | 36.0 | 30.9 | 32.0 |
| 8th Highs are considered 98th percentile until end of year data completeness is calculated. | ||||||