Worst air pollution Danbury, today and tomorrow
Today (9 August): Air quality in Danbury is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 31.7/100).
Tomorrow (10 August 2026): Air quality in Danbury is fair. All pollutants stay as today. Pollution peaks around 1:00 PM (O3: 32.6/100). Airmine updates local air quality forecasts four times daily.
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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 - 9 August | Pollution peaks at 11:00
AQI:
Fair
31.7/100
PM2.5 (fine particles):
Good
7.7/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Fair
28.8/100
O3 (ozone):
Fair
31.7/100
SO2 (sulfur dioxide):
Good
5.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
7.4/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 13:00
AQI:
Fair
32.6/100
PM2.5 (fine particles):
Good
11.9/100
PM10 (coarse particles):
Good
5.7/100
NO2 (nitrogen dioxide):
Fair
29.9/100
O3 (ozone):
Fair
32.6/100
SO2 (sulfur dioxide):
Good
6.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
9.2/100
Pollen forecast in Danbury
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Danbury
Frequently Asked Questions
Is air quality bad in Danbury right now?
On 9 August 2026, overall air quality in Danbury is fair. AQI is the main air quality indicator at 31.7/100. Pollution peaks around 11:00 AM (O3: 31.7/100).
Will air quality be worse tomorrow in Danbury?
On 10 August 2026, air quality conditions in Danbury will be similar to today, with AQI forecast at fair at 32.6/100. Pollution peaks around 1:00 PM (O3: 32.6/100).
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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 10 August 2026 at 02:34 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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