Boston vs Worcester Air Quality Comparison
Which city has cleaner air right now, from the latest EPA AirNow AQI
As of November 8, 2026, Boston, MA has cleaner air than Worcester, MA — AQI 14 (Good) vs 17 (Good), a gap of 3 AQI points in the latest EPA AirNow observations. Lower AQI means cleaner air. Boston's reading is driven by PM2.5 and Worcester's by O3.
Boston, MA
Good
Worcester, MA
Good
Summary
Boston has 3 points better air quality
Boston has an AQI of 14 compared to 17
Reduce Indoor Ozone in Worcester
Today's main pollutant in Worcester is ground-level ozone (AQI 17). 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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