Worst air pollution Thornton, today and tomorrow
Today (16 July): Air quality in Thornton is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 AM (O3: 34.1/100).
Tomorrow (17 July 2026): Air quality in Thornton is fair. NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 6:00 AM (O3: 38.0/100). 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.
Thornton's air quality reflects the Denver northern metropolitan area's Front Range position, with vehicle emissions from I-25 and E-470 the primary local sources in this rapidly growing Adams County suburb. The Rocky Mountains provide clean westerly airflows on most days, while the Denver metropolitan area's temperature inversion problem affects the entire Front Range urban corridor, and the proximity to the Sand Creek industrial corridor and the Commerce City petroleum refinery to the south elevates background industrial PM2.5 above the northern suburban residential average.
Today - 16 July | Pollution peaks at 06:00
AQI:
Fair
34.1/100
PM2.5 (fine particles):
Good
12.9/100
PM10 (coarse particles):
Good
11.7/100
NO2 (nitrogen dioxide):
Fair
22.7/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.9/100
PM1 (ultrafine particles):
Good
8.2/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 06:00
AQI:
Fair
38.0/100
PM2.5 (fine particles):
Good
14.0/100
PM10 (coarse particles):
Good
8.0/100
NO2 (nitrogen dioxide):
Good
14.1/100
O3 (ozone):
Fair
38.0/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.6/100
PM1 (ultrafine particles):
Good
8.9/100
Pollen forecast in Thornton
View pollen forecastFrequently Asked Questions
Is air quality bad in Thornton right now?
On 16 July 2026, overall air quality in Thornton is fair. AQI is the main air quality indicator at 34.1/100. Pollution peaks around 6:00 AM (O3: 34.1/100).
Will air quality be worse tomorrow in Thornton?
On 17 July 2026, air quality conditions in Thornton will be similar to today, with AQI forecast at fair at 38.0/100. Pollution peaks around 6:00 AM (O3: 38.0/100).
When is air pollution at its worst in Thornton?
Air quality across Thornton rises and falls with the seasons. In short, spring and autumn generally bring the cleanest, most stable air, whereas valley and basin locations can see pollution trapped under cold air for days during winter inversions. Higher-elevation, more exposed locations generally avoid the worst of the valley inversion episodes.
Are air quality levels in Thornton 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