Air quality in United States
Air quality in Colorado today
Updated
Good: average US AQI 40 across 21 cities in Colorado Worst now: Brighton, CO (47); cleanest: Pueblo (24).
Live US AQI, PM2.5 and ozone for cities across Colorado, compared with the United States average.
- Average US AQI
- 40 Good
- United States average
- 49 619 cities
- Most polluted now
- Brighton, CO AQI 47
- Cleanest now
- Pueblo AQI 24
- Cities above 100
- 0
Air quality in Colorado today
Right now the modelled air quality in Colorado averages a US AQI of 40 (Good) across the 21 cities we track. By category: 21 Good (of 21).
That is 9 points cleaner than the United States average of 49, ranking 22 of 51 states from cleanest to most polluted.
Brighton, CO has the worst air at 47 (PM2.5 5.7 µg/m³), and Pueblo the cleanest at 24. No tracked city is above 100, so no group needs to change plans.
Colorado cities by AQI (most polluted first)
| City | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Brighton | 47 | Good | 5.7 | 6 | 64 |
| Denver | 46 | Good | 3.7 | 4 | 81 |
| Aurora | 46 | Good | 3.7 | 4 | 81 |
| Lakewood | 46 | Good | 3.7 | 4 | 81 |
| Thornton | 46 | Good | 3.7 | 4 | 81 |
| Westminster | 46 | Good | 3.7 | 4 | 81 |
| Arvada | 46 | Good | 3.7 | 4 | 81 |
| Centennial | 46 | Good | 3.7 | 4 | 81 |
| Golden | 43 | Good | 2.9 | 3 | 87 |
| Greeley | 40 | Good | 4.2 | 5 | 61 |
| Boulder | 40 | Good | 5.8 | 6 | 69 |
| Longmont | 40 | Good | 5.8 | 6 | 69 |
| Erie | 40 | Good | 5.8 | 6 | 69 |
| Evans | 40 | Good | 4.2 | 5 | 61 |
| Louisville | 40 | Good | 5.8 | 6 | 69 |
| Fort Collins | 35 | Good | 5.4 | 6 | 67 |
| Windsor | 35 | Good | 5.4 | 6 | 67 |
| Grand Junction | 31 | Good | 1.8 | 3 | 94 |
| Colorado Springs | 29 | Good | 1.8 | 2 | 82 |
| Fountain | 29 | Good | 1.8 | 2 | 82 |
| Pueblo | 24 | Good | 1.7 | 3 | 73 |
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Modelled by CAMS (Copernicus) via Open-Meteo, refreshed twice a day; read hour by hour from the forecast.
Cities in Colorado
- Air quality in Denver
- Air quality in Colorado Springs
- Air quality in Aurora
- Air quality in Fort Collins
- Air quality in Lakewood
- Air quality in Thornton
- Air quality in Westminster
- Air quality in Arvada
- Air quality in Centennial
- Air quality in Pueblo
- Air quality in Greeley
- Air quality in Boulder
- Air quality in Longmont
- Air quality in Grand Junction
- Air quality in Brighton
- Air quality in Windsor
- Air quality in Pueblo West
- Air quality in Fountain
- Air quality in Erie
- Air quality in Evans
- Air quality in Louisville
- Air quality in Golden
More
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).