SmogRank / World / United States / Massachusetts / January 2023
Most polluted cities in Massachusetts, United States, January 2023
13 cities in Massachusetts, United States ranked by their average PM2.5 over the 31 days. Worst: Haverhill at 9.2 µg/m³, #550 of 1,225 cities in the world. Cleanest: Lynn at 5.1. A city needs measurements on 70% of the days to be ranked.
OpenAQ's archive, where our readings come from, has almost none for 7 of these 31 days. Cities in the United States and Europe have them from the EPA's and the European Environment Agency's own records of the same monitors; elsewhere a city's average is over its other days. Why.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Haverhill 0%
- 2Greenfield 0%
- 3Springfield 0%
- 4North Adams 0%
- 5Brockton 0%
- 5Worcester 0%
- 7Boston 0%
- 8Pittsfield 0%
- 9Fall River 0%
- 10Lowell 0%
- 11North Chicopee 0%
- 11Quincy 0%
- 13Lynn 0%
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
All cities in the world, January 2023 · All cities in United States, January 2023 · Massachusetts now
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SmogRank, most polluted cities in Massachusetts, United States, PM2.5, January 2023, smogrank.com/us/region/massachusetts/history/2023-01 (accessed 7 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.