2026 Ozone Exceedances
(Through May 19, 2026)
Below are the exceedances of the 0.070 parts per million (ppm) eight-hour average ozone standard, and the dates they occurred for each ozone monitor in New England. These data are preliminary, not quality assured and are subject to change.
On this page:
Connecticut
| Monitor Location | Concentration (ppm) | Date/AQI Map |
|---|---|---|
| Danbury | 0.079 | May 19, 2026 Peak Ozone AQI Map |
| East Hartford | 0.083 | |
| Greenwich | 0.080 | |
| Middletown | 0.078 | |
| Stafford | 0.077 | |
| Stratford | 0.074 | |
| Westport | 0.080 | |
| Cornwall | 0.078 | May 18, 2026 Peak Ozone AQI Map |
| Danbury | 0.077 | |
| East Hartford | 0.071 | |
| Middletown | 0.072 | |
| Stafford | 0.071 | |
| Middletown | 0.076 | May 17, 2026 Peak Ozone AQI Map |
| New Haven | 0.071 | |
| Stratford | 0.071 | |
| Westport | 0.072 | |
| Cornwall | 0.071 | May 5, 2026 Peak Ozone AQI Map |
| Stafford | 0.073 | April 14, 2026 Peak Ozone AQI Map |
Maine
| Monitor Location | Concentration (ppm) | Date/AQI Map |
|---|---|---|
Massachusetts
| Monitor Location | Concentration (ppm) | Date/AQI Map |
|---|---|---|
| Greenfield | 0.072 | May 18, 2026 Peak Ozone AQI Map |
| Pittsfield | 0.073 | |
| Ware | 0.071 |
New Hampshire
| Monitor Location | Concentration (ppm) | Date/AQI Map |
|---|---|---|
| Miller State Park | 0.072 | May 5, 2026 Peak Ozone AQI Map |
Rhode Island
| Monitor Location | Concentration (ppm) | Date/AQI Map |
|---|---|---|
| East Providence | 0.071 | May 17, 2026 Peak Ozone AQI Map |
Vermont
| Monitor Location | Concentration (ppm) | Date/AQI Map |
|---|---|---|