Colorado Springs Air Quality in Fall
Across 2019–2025, Colorado Springs's fall (September–November) air quality had a median AQI of 44 (Good) over 637 monitored days in the Colorado Springs, CO area. 0.6% of fall days (4 of 637) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 84.9% of days. The cleanest fall on record here was 2019 (median AQI 43, 0 days above 100) and the worst was 2021 (median 46, 4 days above 100, peak AQI 108).
- Good: 75.5%
- Moderate: 23.9%
- Unhealthy for Sensitive Groups: 0.6%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Colorado Springs
Today's main pollutant in Colorado Springs is ground-level ozone (AQI 41). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Colorado Springs in fall?
Good on a typical day: median AQI 44 across 2019–2025, with 0.6% of fall days above AQI 100. Ground-level ozone is the main driver.
- ✓75.5% of fall days were Good (AQI 0–50), 23.9% Moderate (51–100).
- ✓4 days of 637 reached AQI 101+; the fall peak was 108.
- ✓Cleanest month: November; worst month: September.
Frequently asked questions
What is the air quality like in Colorado Springs in fall?▾
Across 2019–2025, the median daily AQI in Colorado Springs in fall was 44 (Good). 75.5% of days were Good, 23.9% Moderate, and 0.6% reached Unhealthy for Sensitive Groups or worse, based on 637 monitored days in EPA's Air Quality System.
Is fall a good time for outdoor exercise in Colorado Springs?▾
A typical fall day in Colorado Springs sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Which pollutant causes Colorado Springs's fall air quality problems?▾
Ground-level ozone set the daily AQI on 84.9% of fall days in Colorado Springs. The highest fall AQI recorded in 2019–2025 was 108 (Unhealthy for Sensitive Groups), in 2021.
Colorado Springs fall air quality, year by year
Colorado Springs fall air quality by year (Colorado Springs, CO, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 91 | 43 | 0 | 84 | O3 |
| 2020 | 91 | 44 | 0 | 90 | O3 |
| 2021worst | 91 | 46 | 4 | 108 | O3 |
| 2022 | 91 | 44 | 0 | 90 | O3 |
| 2023 | 91 | 45 | 0 | 67 | O3 |
| 2024 | 91 | 46 | 0 | 87 | O3 |
| 2025 | 91 | 43 | 0 | 77 | O3 |
What fall air means in Colorado Springs
A typical fall day in Colorado Springs sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Fall's median AQI of 44 is in line with Colorado Springs's whole-year median of 46, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median Fall AQI across every EPA metro area (296,275 metro-days, 2019–2025) is 40, so Colorado Springs runs above the national Fall norm; 0.6% of its Fall days topped AQI 100 versus 1.5% nationally (about the same).
Within the season, November is the cleanest month (median AQI 41, 0.0% of days above 100) and September the worst (median 51, 1.9% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Colorado Springs
The latest EPA AirNow observation puts Colorado Springs's AQI at 41 (O3). The figures above are multi-year season statistics, not today's reading.
View current Colorado Springs air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Colorado Springs, CO), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.