Cheyenne Air Quality in February
Across 2019–2025, Cheyenne's February air quality had a median AQI of 41 (Good) over 198 monitored days in the Cheyenne, WY area. 0.0% of February days (0 of 198) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 80.3% of days. The cleanest February on record here was 2020 (median AQI 37, 0 days above 100) and the worst was 2025 (median 44, 0 days above 100, peak AQI 60).
- Good: 90.9%
- Moderate: 9.1%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Cheyenne
Today's main pollutant in Cheyenne is ground-level ozone (AQI 31). 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 Cheyenne in February?
Good on a typical day: median AQI 41 across 2019–2025, with 0.0% of February days above AQI 100. Ground-level ozone is the main driver.
- ✓90.9% of February days were Good (AQI 0–50), 9.1% Moderate (51–100).
- ✓0 days of 198 reached AQI 101+; the February peak was 62.
- ✓Best February: 2020; worst February: 2025.
Frequently asked questions
What is the air quality like in Cheyenne in February?▾
Across 2019–2025, the median daily AQI in Cheyenne in February was 41 (Good). 90.9% of days were Good, 9.1% Moderate, and 0.0% 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 Cheyenne?▾
A typical February day in Cheyenne sits in the Good range (median AQI 41), 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 Cheyenne's February air quality problems?▾
Ground-level ozone set the daily AQI on 80.3% of February days in Cheyenne. The highest February AQI recorded in 2019–2025 was 62 (Moderate), in 2025.
Cheyenne February air quality, year by year
Cheyenne February air quality by year (Cheyenne, WY, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 42 | 0 | 62 | O3 |
| 2020cleanest | 29 | 37 | 0 | 51 | O3 |
| 2021 | 28 | 39 | 0 | 59 | O3 |
| 2022 | 28 | 43 | 0 | 52 | O3 |
| 2023 | 28 | 43 | 0 | 55 | O3 |
| 2024 | 29 | 42 | 0 | 48 | O3 |
| 2025worst | 28 | 44 | 0 | 60 | O3 |
What February air means in Cheyenne
A typical February day in Cheyenne sits in the Good range (median AQI 41), 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 41 is in line with Cheyenne's whole-year median of 44, 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 Cheyenne runs in line with the national February norm; 0.0% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of Cheyenne's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Cheyenne
The latest EPA AirNow observation puts Cheyenne's AQI at 31 (O3). The figures above are multi-year month statistics, not today's reading.
View current Cheyenne air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Cheyenne, WY), 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.