Median AQI
10
Good
Wyoming · County air quality · 2025
Uinta County, Wyoming
Median AQI 10 (Good). 100.0% of monitored days rated Good, direct from EPA Air Quality System stations.
- 10
- Median AQI
- 100.0%
- Good-air days
- 0
- Unhealthy days
- 96%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Uinta County's air is good on balance, among the cleanest 5% of US counties, a median AQI of 10 with 100.0% of 87 monitored days in the Good band, driven mainly by PM10.
- 10
- median AQI · Good
- 100.0%
- days rated Good
- PM10
- main pollutant
- 96%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 50.
Data updated July 2026
- Good · 87 d · 100.0%
How did Uinta County's air break down in 2025?
Across 87 monitored days, 87 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 50 (Good).
EPA AQS →Air quality data from EPA Air Quality System (2025). 87 days monitored. Median AQI: 10 (Good).
Insights: Uinta County, Wyoming. EPA monitors recorded a median Air Quality Index of 10 across 87 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 87 (100%) fell in the Good band (AQI 0–50), 0 (0%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 21, while the worst single-day peak hit 50 (Good). Residents averaged about 30.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM10 (87 days). Across the 2020–2025 trend window, good days shifted by -236 and the median AQI moved -30 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 50, good but never Unhealthy. Nearby counties show comparable readings: Albany (51.9% good, AQI 50); Campbell (77.3% good, AQI 43); Carbon (100.0% good, AQI 7); Converse (94.5% good, AQI 41); Fremont (61.3% good, AQI 48); Johnson (90.6% good, AQI 42).
Air Quality Summary
Good Days
100.0%
87 of 87 monitored days
25.0pp vs 75% target
Max AQI Recorded
50
Good
Health Grade
Excellent
90th-pct AQI 21
Uinta County, Good days share 100.0%
National avg
Share of monitored days at AQI 0-50 (Good band).
Uinta County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 87 monitored days across EPA AQI categories.
Good
87
100%
Moderate
0
0%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Uinta County.
- PM10 · 87 days · 100.0%
Health Impact Assessment
Excellent
Uinta County's air quality is rated Excellent based on 100.0% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 100.0% of monitored days in 2025, with a median AQI of 10. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM10, driving AQI on 87 of 87 monitored days.
5-Year Air Quality Trend
Air quality is improving in Uinta County. Best year: 2023 (365 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 323 | 41 | 2 | 0 | 40 | 122 |
| 2021 | 361 | 3 | 0 | 0 | 7 | 60 |
| 2022 | 363 | 2 | 0 | 0 | 7 | 55 |
| 2023 | 365 | 0 | 0 | 0 | 6 | 32 |
| 2024 | 297 | 0 | 0 | 0 | 7 | 44 |
| 2025 | 87 | 0 | 0 | 0 | 10 | 50 |
How does Uinta County compare?
How Uinta County compares
Good-day share better than US avg
Uinta County 100.0%
Albany County, Wyoming 51.9%
US average 76.5%
Median AQI better than US avg
Uinta County 10
Albany County, Wyoming 50
US average 38
Unhealthy days / yr about average
Uinta County 0
Albany County, Wyoming 0
US average 0
Other Counties in Wyoming
Air quality comparison for nearby counties in Wyoming.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Uinta County.
Lincoln County, Wyoming
AQI 10 · 97.8% good
Los Alamos County, New Mexico
AQI 10 · 100.0% good
Washakie County, Wyoming
AQI 10 · 98.0% good
Aleutians East County, Alaska
AQI 11 · 95.0% good
Carroll County, Virginia
AQI 9 · 100.0% good
Dakota County, Minnesota
AQI 9 · 93.4% good
What Uinta County's air means for you
The air here stays in the breathable range year-round, with PM10 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM10 days, the guide explains what a median of 10 means for exposure. Health guidance
- See how Uinta County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Uinta County with its Wyoming neighbours before drawing a conclusion about the region. All of Wyoming
Based on 87 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Uinta County, Wyoming? ▼
Uinta County has a median Air Quality Index (AQI) of 10, rated "Good." 100.0% of monitored days (87 out of 87) had good air quality in 2025.
What is the main pollutant in Uinta County? ▼
The primary pollutant in Uinta County is Coarse Particles (PM10), which was the main AQI driver on 87 days (100% of monitored days). Irritates airways and can aggravate asthma and bronchitis.
How many unhealthy air days does Uinta County have? ▼
In 2025, Uinta County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 50.
Is the air quality in Uinta County getting better or worse? ▼
Air quality in Uinta County is improving based on 5-year trends (2020-2025). Best year: 2023 with 365 good days. Worst year: 2025 with 87 good days.
What does AQI 10 mean for health? ▼
Uinta County's median AQI of 10 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Uinta County compare to other counties in Wyoming? ▼
Uinta County has 100.0% good air days. Nearby counties in Wyoming: Albany (51.9% good), Campbell (77.3% good), Carbon (100.0% good), Converse (94.5% good), Fremont (61.3% good), Johnson (90.6% good).
What is the 90th percentile AQI in Uinta County? ▼
The 90th percentile AQI for Uinta County is 21, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 50 (Good).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.