Cheyenne Air Quality in Spring
Across 2019–2025, Cheyenne's spring (March–May) air quality had a median AQI of 44 (Good) over 643 monitored days in the Cheyenne, WY area. 1.0% of spring days (6 of 643) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 91.3% of days. The cleanest spring on record here was 2020 (median AQI 41, 0 days above 100) and the worst was 2023 (median 48, 5 days above 100, peak AQI 156).
- Good: 77.9%
- Moderate: 21.2%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.2%
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 spring?
Good on a typical day: median AQI 44 across 2019–2025, with 1.0% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓77.9% of spring days were Good (AQI 0–50), 21.2% Moderate (51–100).
- ✓6 days of 643 reached AQI 101+; the spring peak was 156.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Cheyenne in spring?▾
Across 2019–2025, the median daily AQI in Cheyenne in spring was 44 (Good). 77.9% of days were Good, 21.2% Moderate, and 1.0% reached Unhealthy for Sensitive Groups or worse, based on 643 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Cheyenne?▾
A typical spring day in Cheyenne sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of spring days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Cheyenne's spring air quality problems?▾
Ground-level ozone set the daily AQI on 91.3% of spring days in Cheyenne. The highest spring AQI recorded in 2019–2025 was 156 (Unhealthy), in 2023.
Cheyenne spring air quality, year by year
Cheyenne spring air quality by year (Cheyenne, WY, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 44 | 0 | 67 | O3 |
| 2020cleanest | 92 | 41 | 0 | 77 | O3 |
| 2021 | 91 | 44 | 0 | 71 | O3 |
| 2022 | 92 | 44 | 0 | 71 | O3 |
| 2023worst | 92 | 48 | 5 | 156 | O3 |
| 2024 | 92 | 46 | 0 | 77 | O3 |
| 2025 | 92 | 49 | 1 | 108 | O3 |
What spring air means in Cheyenne
A typical spring day in Cheyenne sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of spring days (1.0%) reached AQI 101+ in 2019–2025.
Spring's median AQI of 44 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 Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Cheyenne runs in line with the national Spring norm; 1.0% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, March is the cleanest month (median AQI 43, 0.5% of days above 100) and May the worst (median 47, 1.9% above 100).
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 season 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.