2025 PM2.5 Exceedances
(Through July 15, 2025)
Below are the exceedances of the 35 µg/m3 24-hour average PM2.5 standard and the dates they occurred for each continuous PM2.5 monitor in New England. Data from these monitors are not used for official purposes such as determining if an area meets the PM2.5 standard. All data are preliminary and subject to change.
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Connecticut
| Monitor Location | Concentration (µg/m3) | Date/AQI Map |
|---|---|---|
Maine
| Monitor Location | Concentration (µg/m3) | Date/AQI Map |
|---|---|---|
| Madawaska | 35.7 | July 15, 2025 PM 2.5 AQI Map |
| Portland Tukey | 35.5 | June 8, 2025 PM 2.5 AQI Map |
| Madawaska | 45.4 | June 7, 2025 PM 2.5 AQI Map |
| Presque Isle DEP | 44.2 | |
| Presque Isle Riverside | 39.2 | |
| Madawaska | 47.6 | June 6, 2025 PM 2.5 AQI Map |
| Mi'kmaq Nation | 37.3 | |
| Presque Isle DEP | 47.8 | |
| Presque Isle Riverside | 45.2 |
Massachusetts
| Monitor Location | Concentration (µg/m3) | Date/AQI Map |
|---|---|---|
| Boston-Roxbury | 35.1 | June 8, 2025 PM 2.5 AQI Map |
| Boston-Von Hill | 35.9 |
New Hampshire
| Monitor Location | Concentration (µg/m3) | Date/AQI Map |
|---|---|---|
Rhode Island
| Monitor Location | Concentration (µg/m3) | Date/AQI Map |
|---|---|---|
Vermont
| Monitor Location | Concentration (µg/m3) | Date/AQI Map |
|---|---|---|
| Underhill | 37.5 | June 7, 2025 PM 2.5 AQI Map |