Boston vs Cambridge Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of September 16, 2026, Boston, MA and Cambridge, MA have effectively the same air quality — both at AQI 33 (Good) in the latest EPA AirNow observations. Boston's reading is driven by O3 and Cambridge's by O3.
Boston, MA
Good
Cambridge, MA
Good
Summary
Both cities have similar air quality
Reduce Indoor Ozone in Cambridge
Today's main pollutant in Cambridge is ground-level ozone (AQI 33). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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5-Day Forecast Comparison
| Day | Boston | Cambridge | Better |
|---|---|---|---|
| Today | AQI 60 | AQI 60 | Tie |