What is the air quality in Boston MA?

Boston MA, United States of America has an annual US AQI of 48 (Reasonable) and average PM2.5 of 9.5 µg/m³, ranking #627 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Boston MA?

April is typically the cleanest month (AQI 43) and July the most polluted (AQI 56).

Where does Boston MA's air quality data come from?

PM2.5: 1998–2026 (monitors 1999–2026, satellite 1998; 2026 provisional (AirNow)). Measured by government monitoring stations. Full sources are on the methodology page.

Boston MA, United States of America — Air Quality & Clean City Guide 2026

Boston MA Air Quality Data

Global rank	City	Continent	AQI	PM2.5
627	Boston MA, United States of America	North America	AQI 48	PM2.5 9.5 µg/m³