2024 Ozone Exceedances
(Through September 18, 2024)
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.
| Monitor Location | Date | Concentration (ppm) | AQI Map |
|---|---|---|---|
| Groton | August 28, 2024 | 0.078 | Peak Ozone AQI |
| Madison | August 28, 2024 | 0.082 | |
| Stratford | August 28, 2024 | 0.072 | |
| Greenwich | August 26, 2024 | 0.071 | Peak Ozone AQI |
| Westport | August 26, 2024 | 0.072 | |
| Greenwich | August 25, 2024 | 0.075 | Peak Ozone AQI |
| Groton | August 25, 2024 | 0.071 | |
| Madison | August 25, 2024 | 0.074 | |
| Westport | August 25, 2024 | 0.073 | |
| Greenwich | August 6, 2024 | 0.072 | Peak Ozone AQI |
| New Haven | August 2, 2024 | 0.076 | Peak Ozone AQI |
| Westport | August 2, 2024 | 0.074 | |
| Greenwich | August 1, 2024 | 0.079 | Peak Ozone AQI |
| Stratford | August 1, 2024 | 0.073 | |
| Westport | August 1, 2024 | 0.082 | |
| Danbury | July 17, 2024 | 0.073 | Peak Ozone AQI |
| Greenwich | July 17, 2024 | 0.073 | |
| Cornwall | July 16, 2024 | 0.071 | Peak Ozone AQI |
| Danbury | July 16, 2024 | 0.078 | |
| East Hartford | July 16, 2024 | 0.072 | |
| Greenwich | July 16, 2024 | 0.081 | |
| Middletown | July 16, 2024 | 0.075 | |
| New Haven | July 16, 2024 | 0.074 | |
| Stratford | July 16, 2024 | 0.078 | |
| Westport | July 16, 2024 | 0.085 | |
| Danbury | July 15, 2024 | 0.078 | Peak Ozone AQI |
| Greenwich | July 15, 2024 | 0.074 | |
| Stratford | July 15, 2024 | 0.081 | |
| Middleton | July 11, 2024 | 0.074 | Peak Ozone AQI |
| Westport | July 11, 2024 | 0.073 | |
| Cornwall | July 9, 2024 | 0.072 | Peak Ozone AQI |
| Abington | June 26, 2024 | 0.072 | Peak Ozone AQI |
| East Hartford | June 26, 2024 | 0.074 | |
| Greenwich | June 26, 2024 | 0.080 | |
| Middletown | June 26, 2024 | 0.081 | |
| New Haven | June 26, 2024 | 0.076 | |
| Stafford | June 26, 2024 | 0.072 | |
| Stratford | June 26, 2024 | 0.078 | |
| Westport | June 26, 2024 | 0.082 | |
| New Haven | June 22, 2024 | 0.071 | Peak Ozone AQI |
| Westport | June 22, 2024 | 0.086 | |
| Greenwich | June 21, 2024 | 0.085 | Peak Ozone AQI |
| Groton | June 21, 2024 | 0.076 | |
| Madison | June 21, 2024 | 0.075 | |
| New Haven | June 21, 2024 | 0.078 | |
| Stratford | June 21, 2024 | 0.079 | |
| Westport | June 21, 2024 | 0.087 | |
| Abington | June 20, 2024 | 0.077 | Peak Ozone AQI |
| Danbury | June 20, 2024 | 0.087 | |
| East Hartford | June 20, 2024 | 0.099 | |
| Greenwich | June 20, 2024 | 0.074 | |
| Middletown | June 20, 2024 | 0.096 | |
| New Haven | June 20, 2024 | 0.088 | |
| Stafford | June 20, 2024 | 0.088 | |
| Stratford | June 20, 2024 | 0.072 | |
| Cornwall | June 19, 2024 | 0.072 | Peak Ozone AQI |
| Danbury | June 19, 2024 | 0.079 | |
| East Hartford | June 19, 2024 | 0.076 | |
| Cornwall | June 18, 2024 | 0.076 | Peak Ozone AQI |
| Danbury | June 18, 2024 | 0.078 | |
| East Hartford | June 18, 2024 | 0.072 | |
| Stafford | June 18, 2024 | 0.071 | |
| Cornwall | June 13, 2024 | 0.072 | Peak Ozone AQI |
| Danbury | June 13, 2024 | 0.074 | |
| East Hartford | June 13, 2024 | 0.075 | |
| Middletown | June 13, 2024 | 0.072 | |
| New Haven | June 13, 2024 | 0.072 | |
| Stafford | June 13, 2024 | 0.072 | |
| Westport | June 13, 2024 | 0.072 | |
| Danbury | June 4, 2024 | 0.075 | Peak Ozone AQI |
| Cornwall | June 3, 2024 | 0.076 | Peak Ozone AQI |
| Greenwich | June 3, 2024 | 0.071 | |
| Groton | June 3, 2024 | 0.077 | |
| Madison | June 3, 2024 | 0.080 | |
| New Haven | June 3, 2024 | 0.077 | |
| Stratford | June 3, 2024 | 0.081 | |
| Westford | June 3, 2024 | 0.077 | |
| Middletown | June 2, 2024 | 0.074 | Peak Ozone AQI |
| New Haven | June 2, 2024 | 0.081 | |
| Westport | June 2, 2024 | 0.077 | |
| Groton | May 24, 2024 | 0.073 | Peak Ozone AQI |
| Madison | May 24, 2024 | 0.072 | |
| Cornwall | May 22, 2024 | 0.071 | Peak Ozone AQI |
| Danbury | May 22, 2024 | 0.075 | |
| East Harford | May 22, 2024 | 0.072 | |
| Stafford | May 22, 2024 | 0.076 |
| Monitor Location | Date | Concentration (ppm) | AQI Map |
|---|---|---|---|
| Bar Harbor | September 18, 2024 | 0.072 | Peak Ozone AQI |
| Cape Elizabeth | June 19, 2024 | 0.076 | Peak Ozone AQI |
| Kennebunkport | June 19, 2024 | 0.079 |
| Monitor Location | Date | Concentration (ppm) | AQI Map |
|---|---|---|---|
| Fall River | August 25, 2024 | 0.073 | Peak Ozone AQI |
| Chicopee | July 9, 2024 | 0.073 | Peak Ozone AQI |
| Chicopee | June 18, 2024 | 0.076 | Peak Ozone AQI |
| Ware | June 18, 2024 | 0.073 | |
| Fall River | May 24, 2024 | 0.071 | Peak Ozone AQI |
| Martha's Vineyard | May 24, 2024 | 0.073 | |
| Truro | May 24, 2024 | 0.071 | |
| Ware | May 22, 2024 | 0.074 | Peak Ozone AQI |
| Monitor Location | Date | Concentration (ppm) | AQI Map |
|---|---|---|---|
| Odiorne State Park | June 19, 2024 | 0.075 | Peak Ozone AQI |
| Monitor Location | Date | Concentration (ppm) | AQI Map |
|---|---|---|---|
| East Matunuck | August 28, 2024 | 0.084 | Peak Ozone AQI |
| Narragansett | August 25, 2024 | 0.073 | Peak Ozone AQI |
| East Matunuck | May 24, 2024 | 0.073 | Peak Ozone AQI |
| Narragansett | May 24, 2024 | 0.077 |
| Monitor Location | Date | Concentration (ppm) | AQI Map |
|---|---|---|---|