Worst air pollution Capitol Hill - Denver, today and tomorrow
Today (9 August): Air quality in Capitol Hill is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 35.7/100).
Tomorrow (10 August 2026): Air quality in Capitol Hill is fair. All pollutants stay as today. Pollution peaks around 6:00 AM (O3: 34.8/100). 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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Denver's Capitol Hill air quality reflects the dense inner-city residential and commercial neighbourhood, with vehicle traffic on Colfax Avenue — historically one of the US's longest commercial streets — and the surrounding dense mixed residential character generating moderate local NOₓ. The Rocky Mountain westerlies provide clean background ventilation on most days, while the Front Range temperature inversion creates winter episodes and Capitol Hill maintains moderate Denver metropolitan readings throughout the year.
Today - 9 August | Pollution peaks at 10:00
AQI:
Fair
35.7/100
PM2.5 (fine particles):
Good
11.4/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
7.5/100
O3 (ozone):
Fair
35.7/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.3/100
PM1 (ultrafine particles):
Good
8.5/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 06:00
AQI:
Fair
34.8/100
PM2.5 (fine particles):
Good
9.5/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Good
5.1/100
O3 (ozone):
Fair
34.8/100
SO2 (sulfur dioxide):
Good
1.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.3/100
PM1 (ultrafine particles):
Good
7.5/100
Other Landmarks in Denver
Sports venues in Denver
Frequently Asked Questions
Is air quality bad in Capitol Hill right now?
On 9 August 2026, overall air quality in Capitol Hill is fair. AQI is the main air quality indicator at 35.7/100. Pollution peaks around 10:00 AM (O3: 35.7/100).
Will air quality be worse tomorrow in Capitol Hill?
On 10 August 2026, air quality conditions in Capitol Hill will be similar to today, with AQI forecast at fair at 34.8/100. Pollution peaks around 6:00 AM (O3: 34.8/100).
When is air pollution at its worst in Capitol Hill?
Capitol Hill follows Denver's typical seasonal air quality pattern. In short, spring and autumn generally bring the cleanest, most stable air, whereas summer brings regional wildfire smoke, while winter brings its own inversion-driven pollution episodes. Valley and basin locations are especially prone to these winter inversion episodes compared to more exposed, higher terrain.
Are air quality levels in Capitol Hill 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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