What is the air quality in Norwich CT?

Norwich CT, United States of America has an annual US AQI of 45 (Reasonable) and average PM2.5 of 8.3 µg/m³, ranking #444 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Norwich CT?

April is typically the cleanest month (AQI 36) and July the most polluted (AQI 59).

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

PM2.5: 1998–2024 (monitors 1999–2013, satellite 1998–2003, 2005–2006, 2012, 2014–2024). Measured by government monitoring stations. Full sources are on the methodology page.

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

Norwich CT Air Quality Data

Global rank	City	Continent	AQI	PM2.5
444	Norwich CT, United States of America	North America	AQI 45	PM2.5 8.3 µg/m³