SmogRank / Countries / United States / Massachusetts

Most polluted cities in Massachusetts, United States

16 measured cities ranked by PM2.5, last 7 days. Worst: Quincy at 4.6 µg/m³, #1942 in the world.

#City µg/m³
1Quincy Massachusetts
4.6
2Fall River Massachusetts
4.2
3Boston Massachusetts
3.7
4Springfield Massachusetts
3.6
5Brockton Massachusetts
3.5
6Lynn Massachusetts
3.4
7Lowell Massachusetts
3.2
8Greenfield Massachusetts
2.9
9Haverhill Massachusetts
2.9
10Framingham Massachusetts
2.7
11Milford Massachusetts
2.6
12Worcester Massachusetts
2.6
13Pittsfield Massachusetts
2.5
14North Chicopee Massachusetts
2.4
15Lexington low-cost sensorsMassachusetts
0.3
16Newton low-cost sensorsMassachusetts
0.1
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

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.

City7-day estimateBand
Cambridge estimated≈ 4 µg/m³Good
New Bedford estimated≈ 4 µg/m³Good
Dorchester estimated≈ 4 µg/m³Good
Somerville estimated≈ 4 µg/m³Good
Lawrence estimated≈ 3 µg/m³Good
Framingham Center estimated≈ 3 µg/m³Good
Waltham estimated≈ 4 µg/m³Good
Malden estimated≈ 4 µg/m³Good
Brookline estimated≈ 4 µg/m³Good
Medford estimated≈ 4 µg/m³Good
Taunton estimated≈ 4 µg/m³Good
Chicopee estimated≈ 3 µg/m³Good
Weymouth estimated≈ 5 µg/m³Good
Revere estimated≈ 4 µg/m³Good
Peabody estimated≈ 5 µg/m³Good
Methuen estimated≈ 3 µg/m³Good
South Peabody estimated≈ 5 µg/m³Good
Barnstable estimated≈ 4 µg/m³Good
Everett estimated≈ 4 µg/m³Good
Brighton estimated≈ 4 µg/m³Good
Attleboro estimated≈ 4 µg/m³Good
East Boston estimated≈ 4 µg/m³Good
Salem estimated≈ 5 µg/m³Good
Arlington estimated≈ 4 µg/m³Good
Westfield estimated≈ 3 µg/m³Good
Leominster estimated≈ 3 µg/m³Good
Beverly estimated≈ 5 µg/m³Good
Holyoke estimated≈ 2 µg/m³Good
Fitchburg estimated≈ 2 µg/m³Good
Beverly Cove estimated≈ 5 µg/m³Good
Billerica estimated≈ 4 µg/m³Good
Amherst estimated≈ 2 µg/m³Good
Marlborough estimated≈ 3 µg/m³Good
Woburn estimated≈ 4 µg/m³Good
Chelsea estimated≈ 4 µg/m³Good
Braintree estimated≈ 4 µg/m³Good
Mattapan estimated≈ 4 µg/m³Good
Chelmsford estimated≈ 4 µg/m³Good
Shrewsbury estimated≈ 3 µg/m³Good
Natick estimated≈ 4 µg/m³Good

Updated 2026-10-01 13:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.