SmogRank / Countries / United States / Massachusetts
Most polluted cities in Massachusetts, United States
11 measured cities, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Pittsfield at 6.7 µg/m³, #364 in the world.
11 good
- 1Pittsfield 6.70.4×
- 2Greenfield 6.30.4×
- 3Brockton 5.70.4×
- 4Lowell 5.60.4×
- 5Lynn 5.20.3×
- 6Boston 5.10.3×
- 7Worcester 5.10.3×
- 8Milford 5.00.3×
- 9Haverhill 4.90.3×
- 10Framingham 4.80.3×
- 11Quincy 4.70.3×
Estimated: cities without a monitor
Massachusetts cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Cambridge | ≈ 4 µg/m³ |
| New Bedford | ≈ 4 µg/m³ |
| Dorchester | ≈ 4 µg/m³ |
| Somerville | ≈ 4 µg/m³ |
| Lawrence | ≈ 3 µg/m³ |
| Framingham Center | ≈ 3 µg/m³ |
| Waltham | ≈ 4 µg/m³ |
| Malden | ≈ 4 µg/m³ |
| Brookline | ≈ 4 µg/m³ |
| Medford | ≈ 4 µg/m³ |
| Taunton | ≈ 4 µg/m³ |
| Chicopee | ≈ 3 µg/m³ |
| Weymouth | ≈ 5 µg/m³ |
| Revere | ≈ 4 µg/m³ |
| Peabody | ≈ 5 µg/m³ |
| Methuen | ≈ 3 µg/m³ |
| South Peabody | ≈ 5 µg/m³ |
| Barnstable | ≈ 4 µg/m³ |
| Everett | ≈ 4 µg/m³ |
| Brighton | ≈ 4 µg/m³ |
| Attleboro | ≈ 4 µg/m³ |
| East Boston | ≈ 4 µg/m³ |
| Salem | ≈ 5 µg/m³ |
| Arlington | ≈ 4 µg/m³ |
| Westfield | ≈ 3 µg/m³ |
| Leominster | ≈ 3 µg/m³ |
| Beverly | ≈ 5 µg/m³ |
| Holyoke | ≈ 2 µg/m³ |
| Fitchburg | ≈ 2 µg/m³ |
| Beverly Cove | ≈ 5 µg/m³ |
| Billerica | ≈ 4 µg/m³ |
| Amherst | ≈ 2 µg/m³ |
| Marlborough | ≈ 3 µg/m³ |
| Woburn | ≈ 4 µg/m³ |
| Chelsea | ≈ 4 µg/m³ |
| Braintree | ≈ 4 µg/m³ |
| Mattapan | ≈ 4 µg/m³ |
| Chelmsford | ≈ 4 µg/m³ |
| Shrewsbury | ≈ 3 µg/m³ |
| Natick | ≈ 4 µg/m³ |
Updated 2026-10-01 18:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.