| Oklahoma Department of Environmental Quality | ||||||
| 2025 SO2 | ||||||
| 4th Highest 1-hour Daily Maximum (ppb) through March 11, 2025 | ||||||
| Standard: The 99th percentile of 1-hour daily max concentrations averaged across 3 years must be below 75 ppb. | ||||||
| Site | 99th Percentile (ppb) | 3-Yr Avg. | ||||
| 2022 | 2023 | 2024 | 2025* | 22-24 | 23-25* | |
| Ponca City | 10.0 | 5.0 | 7.0 | 4.0 | 7.3 | 5.3 |
| OKC North | 1.0 | 1.0 | 1.0 | 0.0 | 1.0 | 0.7 |
| Tulsa Newblock | 6.0 | 8.0 | 4.0 | 1.0 | 6.0 | 4.3 |
| Tulsa TCWD | 2.0 | 5.0 | 1.0 | 2.0 | 2.7 | 2.7 |
| Tulsa Central | 3.6 | 3.1 | 2.8 | 1.6 | 3.2 | 2.5 |
| Oxbow/Kremlin | 38.0 | 37.0 | 47.0 | 18.0 | 40.7 | 34.0 |
| *4th highs are considered 99th percentile until end of year data completeness is calculated | ||||||
| All data is subject to change upon QA/QC -- data collection for 2025 is ongoing. | ||||||