Where is the air worst in Massachusetts right now?

Greenfield has the highest current reading at AQI 57 (Moderate).

How often are readings updated?

Monitors report every hour. We refresh this page with the latest hour from EPA AirNow.

Massachusetts Air Quality

Current AQI at 17 monitors, highest 57 (Moderate) · Measured 10/30/2026, 4:00 AM PT

Monitors: 17
Highest AQI: 57; Moderate
Typical (median): 42; Good
Above 100: 0

Monitoring sites in Massachusetts

Worst first. Times are local.

57GreenfieldModerate · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
57North AdamsModerate · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
56SpringfieldModerate · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
55Worcester - Summer StModerate · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
52UxbridgeModerate · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
46ChicopeeGood · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
44LynnGood · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
43Fall RiverGood · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
42Boston - Kenmore SqGood · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
40Boston - RoxburyGood · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
39Boston - Von Hillern StGood · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
34TruroGood · Ozone · Fri 10/30/2026, 6:00 AM EDT
34Wampanoag Laboratory - Martha's VineyardGood · Ozone · Fri 10/30/2026, 6:00 AM EDT
33BrocktonGood · Fine particles (PM2.5) · Fri 10/30/2026, 6:00 AM EDT
31FairhavenGood · Ozone · Fri 10/30/2026, 6:00 AM EDT
28Worcester - AirportGood · Ozone · Fri 10/30/2026, 6:00 AM EDT
22Chelmsford - EPAGood · Ozone · Fri 10/30/2026, 6:00 AM EDT

By county

Highest current AQI among the county's monitors

Frequently asked questions

Where is the air worst in Massachusetts right now?: Greenfield has the highest current reading at AQI 57 (Moderate).
How often are readings updated?: Monitors report every hour. We refresh this page with the latest hour from EPA AirNow.

Source: EPA AirNow · Last updated 10/30/2026 · Data are preliminary and subject to change

What the AQI means

0-50Good. Air quality is satisfactory and poses little or no risk.
51-100Moderate. Acceptable. A few unusually sensitive people may have symptoms.
101-150Unhealthy for Sensitive Groups. People with heart or lung disease, older adults, children and teens should limit long or heavy outdoor exertion.
151-200Unhealthy. Everyone may begin to feel effects. Sensitive groups should avoid long or heavy outdoor exertion.
201-300Very Unhealthy. Health alert: the risk of health effects is increased for everyone.
301-500Hazardous. Health warning of emergency conditions. Everyone is more likely to be affected.

Data sources

AirNowU.S. Environmental Protection Agency · Official site

Data as of 10/30/2026

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About this data

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