SmogRank / Countries / United States / Massachusetts

Most polluted cities in Massachusetts, United States

15 measured cities, this year; 15 above the WHO annual guideline. Worst: Springfield at 6.9 µg/m³, #1,781 in the world.

15 good

  1. 1Springfield 6.91.4×
  2. 2Brockton 6.81.4×
  3. 3Boston 6.41.3×
  4. 4Greenfield 6.41.3×
  5. 5Fall River 6.11.2×
  6. 6Framingham 6.01.2×
  7. 7Haverhill 6.01.2×
  8. 8Lowell 6.01.2×
  9. 9Lynn 6.01.2×
  10. 10Lexingtonlow-cost sensors 5.91.2×
  11. 11Worcester 5.91.2×
  12. 12Pittsfield 5.71.1×
  13. 13Quincy 5.71.1×
  14. 14Milford 5.61.1×
  15. 15North Chicopee 5.61.1×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

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

Updated 2026-10-01 18:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.