Worst air pollution Norwich, today and tomorrow
Today (16 July): Air quality in Norwich is fair. O3 is fair; AQI and NO2 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 AM (NO2: 46.4/100).
Tomorrow (17 July 2026): Air quality in Norwich is fair. All pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 49.6/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Norwich's air quality reflects its position at the confluence of the Yantic, Shetucket, and Thames Rivers in southeastern Connecticut, with vehicle emissions from I-395 and the surrounding historic mill town and casino-adjacent tourism traffic contributing local sources. The river valleys create modest topographic variation, while the broader southeastern New England regional airshed contributes summer ozone throughout the year.
Today - 16 July | Pollution peaks at 01:00
AQI:
Medium
46.4/100
PM2.5 (fine particles):
Good
16.8/100
PM10 (coarse particles):
Good
17.3/100
NO2 (nitrogen dioxide):
Medium
46.4/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
7.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.5/100
PM1 (ultrafine particles):
Good
11.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Medium
49.6/100
PM2.5 (fine particles):
Good
10.9/100
PM10 (coarse particles):
Good
4.4/100
NO2 (nitrogen dioxide):
Medium
49.6/100
O3 (ozone):
Fair
37.6/100
SO2 (sulfur dioxide):
Good
3.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
9.0/100
Pollen forecast in Norwich
View pollen forecastFrequently Asked Questions
Is air quality bad in Norwich right now?
On 16 July 2026, overall air quality in Norwich is fair. O3 is the main pollutant at 36.7/100. Pollution peaks around 1:00 AM (NO2: 46.4/100).
Will air quality be worse tomorrow in Norwich?
On 17 July 2026, air quality conditions in Norwich will be similar to today, with O3 forecast at fair at 37.6/100. Pollution peaks around 11:00 PM (NO2: 49.6/100).
When is air pollution at its worst in Norwich?
Norwich experiences a distinct seasonal swing in air quality: the shoulder seasons bring the most consistently clean air of the year, but hot, humid summer days bring the highest ozone risk, often worsened by pollution transported in from other regions. Winter cold fronts tend to clear the air quickly, so extended pollution episodes are relatively uncommon.
Are air quality levels in Norwich based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Want to see air quality forecasts for other cities in United States?
Check air quality in other popular cities:
Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app