2021 PM2.5 Exceedances
(Through September 30, 2021)
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.
| Monitor Location | Date | Concentration (µg/m3) |
AQI Map |
|---|---|---|---|
| Groton | July 27, 2021 | 37.5 | PM 2.5 AQI |
| New Haven | July 27, 2021 | 40 | |
| Waterbury | July 27, 2021 | 38.3 | |
| Bridgeport | July 26, 2021 | 35.8 | PM 2.5 AQI |
| Cornwall | July 26, 2021 | 52.2 | |
| Danbury | July 26, 2021 | 36.4 | |
| East Hartford | July 26, 2021 | 49.8 | |
| Hartford | July 26, 2021 | 49.6 | |
| New Haven | July 26, 2021 | 37 | |
| Waterbury | July 26, 2021 | 50.9 | |
| Bridgeport | July 20, 2021 | 40.8 | PM 2.5 AQI |
| Cornwall | July 20, 2021 | 50.3 | |
| Danbury | July 20, 2021 | 49.5 | |
| East Hartford | July 20, 2021 | 42 | |
| Hartford | July 20, 2021 | 43.9 | |
| New Haven | July 20, 2021 | 37.7 | |
| Waterbury | July 20, 2021 | 52.6 |
| Monitor Location | Date | Concentration (µg/m3) |
AQI Map |
|---|---|---|---|
| Rumford | July 26, 2021 | 40.2 | PM 2.5 AQI |
| Monitor Location | Date | Concentration (µg/m3) |
AQI Map |
|---|---|---|---|
| Boston–Kenmore | July 26, 2021 | 53.4 | PM 2.5 AQI |
| Boston–Roxbury | July 26, 2021 | 41.1 | |
| Boston–Von Hillern | July 26, 2021 | 44.1 | |
| Chelmsford | July 26, 2021 | 59 | |
| Chelsea | July 26, 2021 | 61.6 | |
| Chicopee | July 26, 2021 | 41.4 | |
| Haverhill | July 26, 2021 | 40.5 | |
| Lynn | July 26, 2021 | 44.3 | |
| Springfield | July 26, 2021 | 36.9 | |
| Weymouth | July 26, 2021 | 50 | |
| Worcester | July 26, 2021 | 45.2 | |
| Chelmsford | July 20, 2021 | 35.7 | PM 2.5 AQI |
| Chelsea | July 20, 2021 | 35.5 | |
| Pittsfield | July 20, 2021 | 39.4 | |
| Worcester | July 20, 2021 | 36.5 |
| Monitor Location | Date | Concentration (µg/m3) |
AQI Map |
|---|---|---|---|
| Keene | July 26, 2021 | 45.9 | PM 2.5 AQI |
| Laconia | July 26, 2021 | 39.2 | |
| Lebanon | July 26, 2021 | 37.5 | |
| Londonderry | July 26, 2021 | 54.1 | |
| Miller State Park | July 26, 2021 | 53 | |
| Portsmouth | July 26, 2021 | 37.7 | |
| Londonderry | July 20, 2021 | 35.9 | PM 2.5 AQI |
| Miller State Park | July 20, 2021 | 37.4 |
| Monitor Location | Date | Concentration (µg/m3) |
AQI Map |
|---|---|---|---|
| CCRI Providence | July 26, 2021 | 40.8 | PM 2.5 AQI |
| East Providence | July 26, 2021 | 42.5 | |
| Near Road | July 26, 2021 | 41.4 | |
| West Greenwich | July 26, 2021 | 42.3 |
| Monitor Location | Date | Concentration (µg/m3) |
AQI Map |
|---|---|---|---|
| Bennington | July 26, 2021 | 41.2 | PM 2.5 AQI |
| Burlington | July 26, 2021 | 47 | |
| Rutland | July 26, 2021 | 40.8 | |
| Underhill | July 26, 2021 | 46.2 |