Worst air pollution Highlands Ranch, today and tomorrow
Today (16 July): Air quality in Highlands Ranch is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 37.2/100).
Tomorrow (17 July 2026): Air quality in Highlands Ranch is fair. All pollutants stay as today. Pollution peaks around 11:00 AM (O3: 39.1/100). 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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Highlands Ranch's air quality reflects the Denver southern metropolitan Front Range position, with vehicle emissions from C-470 and US-85 the primary local sources in this affluent Douglas County planned community. The Rocky Mountains provide clean westerly airflows on most days, while the Denver basin's temperature inversion problem periodically affects the southern Front Range corridor and the planned community's residential character generally produces moderate suburban emission levels.
Today - 16 July | Pollution peaks at 12:00
AQI:
Fair
37.2/100
PM2.5 (fine particles):
Good
15.1/100
PM10 (coarse particles):
Good
11.6/100
NO2 (nitrogen dioxide):
Good
17.6/100
O3 (ozone):
Fair
37.2/100
SO2 (sulfur dioxide):
Good
2.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.1/100
PM1 (ultrafine particles):
Good
10.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 11:00
AQI:
Fair
39.1/100
PM2.5 (fine particles):
Good
16.8/100
PM10 (coarse particles):
Good
10.3/100
NO2 (nitrogen dioxide):
Good
15.6/100
O3 (ozone):
Fair
39.1/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
11.1/100
Pollen forecast in Highlands Ranch
View pollen forecastFrequently Asked Questions
Is air quality bad in Highlands Ranch right now?
On 16 July 2026, overall air quality in Highlands Ranch is fair. AQI is the main air quality indicator at 37.2/100. Pollution peaks around 12:00 PM (O3: 37.2/100).
Will air quality be worse tomorrow in Highlands Ranch?
On 17 July 2026, air quality conditions in Highlands Ranch will be similar to today, with AQI forecast at fair at 39.1/100. Pollution peaks around 11:00 AM (O3: 39.1/100).
When is air pollution at its worst in Highlands Ranch?
Highlands Ranch's air quality follows a clear seasonal pattern, as spring and autumn generally bring the cleanest, most stable air; by contrast, winter temperature inversions can trap cold air and pollution in valleys and basins for days at a time. Valley and basin locations are especially prone to these winter inversion episodes compared to more exposed, higher terrain.
Are air quality levels in Highlands Ranch 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