Fort Collins Air Quality in February
Across 2019–2025, Fort Collins's February air quality had a median AQI of 49 (Good) over 198 monitored days in the Fort Collins, CO area. 0.5% of February days (1 of 198) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.7% of days. The cleanest February on record here was 2020 (median AQI 45, 0 days above 100) and the worst was 2021 (median 49, 1 day above 100, peak AQI 121).
- Good: 58.6%
- Moderate: 40.9%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Fort Collins
Today's main pollutant in Fort Collins is ground-level ozone (AQI 36). 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 Fort Collins in February?
Good on a typical day: median AQI 49 across 2019–2025, with 0.5% of February days above AQI 100. Ground-level ozone is the main driver.
- ✓58.6% of February days were Good (AQI 0–50), 40.9% Moderate (51–100).
- ✓1 day of 198 reached AQI 101+; the February peak was 121.
- ✓Best February: 2020; worst February: 2021.
Frequently asked questions
What is the air quality like in Fort Collins in February?▾
Across 2019–2025, the median daily AQI in Fort Collins in February was 49 (Good). 58.6% of days were Good, 40.9% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Fort Collins?▾
A typical February day in Fort Collins sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
Which pollutant causes Fort Collins's February air quality problems?▾
Ground-level ozone set the daily AQI on 65.7% of February days in Fort Collins. The highest February AQI recorded in 2019–2025 was 121 (Unhealthy for Sensitive Groups), in 2021.
Fort Collins February air quality, year by year
Fort Collins February air quality by year (Fort Collins, CO, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 54 | 0 | 75 | PM2.5 |
| 2020cleanest | 29 | 45 | 0 | 61 | O3 |
| 2021worst | 28 | 49 | 1 | 121 | O3 |
| 2022 | 28 | 48 | 0 | 67 | O3 |
| 2023 | 28 | 50 | 0 | 76 | O3 |
| 2024 | 29 | 47 | 0 | 55 | O3 |
| 2025 | 28 | 51 | 0 | 74 | O3 |
What February air means in Fort Collins
A typical February day in Fort Collins sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
February's median AQI of 49 is in line with Fort Collins's whole-year median of 51, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Fort Collins runs above the national February norm; 0.5% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of Fort Collins's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Fort Collins
The latest EPA AirNow observation puts Fort Collins's AQI at 36 (O3). The figures above are multi-year month statistics, not today's reading.
View current Fort Collins air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Fort Collins, 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.