Worst air pollution Danbury, today and tomorrow
Today (16 July): Air quality in Danbury 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: 48.3/100).
Tomorrow (17 July 2026): Air quality in Danbury is fair. All pollutants stay as today. Pollution peaks around 11:00 PM (NO2: 51.8/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Danbury's air quality reflects its position in the Housatonic River valley in southwestern Connecticut, with vehicle emissions from I-84 and the surrounding manufacturing and technology corridor contributing local sources in this outer New York metropolitan commuter city. The surrounding Connecticut uplands provide modest topographic variation, while the broader New York-New Jersey metropolitan area's regional ozone and PM2.5 plume on prevailing southwesterly winds elevates background pollution levels above what the Connecticut rural landscape alone would suggest.
Today - 16 July | Pollution peaks at 01:00
AQI:
Medium
48.3/100
PM2.5 (fine particles):
Good
17.5/100
PM10 (coarse particles):
Good
18.0/100
NO2 (nitrogen dioxide):
Medium
48.3/100
O3 (ozone):
Fair
36.7/100
SO2 (sulfur dioxide):
Good
8.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.5/100
PM1 (ultrafine particles):
Good
11.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 23:00
AQI:
Medium
51.8/100
PM2.5 (fine particles):
Good
11.3/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Medium
51.8/100
O3 (ozone):
Fair
37.6/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
9.3/100
Pollen forecast in Danbury
View pollen forecastFrequently Asked Questions
Is air quality bad in Danbury right now?
On 16 July 2026, overall air quality in Danbury is fair. O3 is the main pollutant at 36.7/100. Pollution peaks around 1:00 AM (NO2: 48.3/100).
Will air quality be worse tomorrow in Danbury?
On 17 July 2026, air quality conditions in Danbury will be similar to today, with O3 forecast at fair at 37.6/100. Pollution peaks around 11:00 PM (NO2: 51.8/100).
When is air pollution at its worst in Danbury?
Like most US cities, Danbury sees air quality shift from season to season, as spring and autumn generally bring the cleanest air, helped by more active weather patterns; by contrast, summer heat waves, often worsened by haze drifting in from other regions, bring the year's worst air. Coastal sea breezes can offer some relief from inland summer ozone buildup.
Are air quality levels in Danbury 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.
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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