Median AQI
50
Good
Wyoming · County air quality · 2025
Albany County, Wyoming
Median AQI 50 (Good). 51.9% of monitored days rated Good, direct from EPA Air Quality System stations.
- 50
- Median AQI
- 51.9%
- Good-air days
- 0
- Unhealthy days
- 8%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Albany County's air is good on balance, among the most polluted counties nationally, a median AQI of 50 with 51.9% of 243 monitored days in the Good band, driven mainly by Ozone.
- 50
- median AQI · Good
- 51.9%
- days rated Good
- Ozone
- main pollutant
- 8%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 144.
Data updated July 2026
- Good · 126 d · 51.9%
- Moderate · 114 d · 46.9%
- USG · 3 d · 1.2%
How did Albany County's air break down in 2025?
Across 243 monitored days, 126 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 144 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 243 days monitored. Median AQI: 50 (Good).
Insights: Albany County, Wyoming. EPA monitors recorded a median Air Quality Index of 50 across 243 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 126 (52%) fell in the Good band (AQI 0–50), 114 (47%) registered Moderate readings, and 3 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 74, while the worst single-day peak hit 144 (USG). Residents averaged about 15.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (209 days), PM10 (32 days), PM2.5 (2 days). Across the 2020–2025 trend window, good days shifted by -125 and the median AQI moved +4 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 144, usg but never Unhealthy. Nearby counties show comparable readings: 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); Laramie (69.8% good, AQI 47).
Air Quality Summary
Good Days
51.9%
126 of 243 monitored days
-23.1pp vs 75% target
Max AQI Recorded
144
USG
Health Grade
Moderate
90th-pct AQI 74
Albany County, Good days share 51.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Albany 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 243 monitored days across EPA AQI categories.
Good
126
52%
Moderate
114
47%
USG
3
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Albany County.
- Ozone · 209 days · 86.0%
- PM10 · 32 days · 13.2%
- PM2.5 · 2 days · 0.8%
Health Impact Assessment
Moderate
Albany County's air quality is rated Moderate based on 51.9% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 51.9% of monitored days in 2025, with a median AQI of 50. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 209 of 243 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Albany County. Best year: 2020 (251 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 251 | 106 | 7 | 2 | 46 | 187 |
| 2021 | 193 | 158 | 13 | 0 | 50 | 312 |
| 2022 | 225 | 136 | 2 | 2 | 48 | 159 |
| 2023 | 212 | 149 | 4 | 0 | 48 | 132 |
| 2024 | 190 | 163 | 12 | 1 | 50 | 187 |
| 2025 | 126 | 114 | 3 | 0 | 50 | 144 |
How does Albany County compare?
How Albany County compares
Good-day share worse than US avg
Albany County 51.9%
Campbell County, Wyoming 77.3%
US average 76.5%
Median AQI worse than US avg
Albany County 50
Campbell County, Wyoming 43
US average 38
Unhealthy days / yr about average
Albany County 0
Campbell 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 Albany County.
Adams County, Colorado
AQI 50 · 50.2% good
Boulder County, Colorado
AQI 50 · 50.9% good
Davidson County, North Carolina
AQI 50 · 50.2% good
Davidson County, Tennessee
AQI 50 · 51.8% good
Gila County, Arizona
AQI 50 · 52.0% good
Jefferson County, Ohio
AQI 50 · 50.5% good
What Albany County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 50 means for exposure. Health guidance
- See how Albany County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Albany County with its Wyoming neighbours before drawing a conclusion about the region. All of Wyoming
Based on 243 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 Albany County, Wyoming? ▼
Albany County has a median Air Quality Index (AQI) of 50, rated "Good." 51.9% of monitored days (126 out of 243) had good air quality in 2025.
What is the main pollutant in Albany County? ▼
The primary pollutant in Albany County is Ozone (O3), which was the main AQI driver on 209 days (86% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Albany County have? ▼
In 2025, Albany County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 144.
Is the air quality in Albany County getting better or worse? ▼
Air quality in Albany County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 251 good days. Worst year: 2025 with 126 good days.
What does AQI 50 mean for health? ▼
Albany County's median AQI of 50 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 Albany County compare to other counties in Wyoming? ▼
Albany County has 51.9% good air days. Nearby counties in Wyoming: Campbell (77.3% good), Carbon (100.0% good), Converse (94.5% good), Fremont (61.3% good), Johnson (90.6% good), Laramie (69.8% good).
What is the 90th percentile AQI in Albany County? ▼
The 90th percentile AQI for Albany County is 74, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 144 (USG).
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.