What is the air quality in Hartford CT?

Hartford CT, United States of America has an annual US AQI of 47 (Reasonable) and average PM2.5 of 8.9 µg/m³, ranking #552 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Hartford CT?

October is typically the cleanest month (AQI 40) and July the most polluted (AQI 55).

Where does Hartford CT's air quality data come from?

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

Hartford CT, United States of America — Air Quality & Clean City Guide 2026

Hartford CT Air Quality Data

Global rank	City	Continent	AQI	PM2.5
552	Hartford CT, United States of America	North America	AQI 47	PM2.5 8.9 µg/m³