Median AQI
10
Good
Wyoming · County air quality · 2025
Lincoln County, Wyoming
Median AQI 10 (Good). 97.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 10
- Median AQI
- 97.8%
- Good-air days
- 0
- Unhealthy days
- 95%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Lincoln County's air is good on balance, among the cleanest 5% of US counties, a median AQI of 10 with 97.8% of 181 monitored days in the Good band, driven mainly by PM10.
- 10
- median AQI · Good
- 97.8%
- days rated Good
- PM10
- main pollutant
- 95%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 77.
Data updated July 2026
- Good · 177 d · 97.8%
- Moderate · 4 d · 2.2%
How did Lincoln County's air break down in 2025?
Across 181 monitored days, 177 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 77 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 181 days monitored. Median AQI: 10 (Good).
Insights: Lincoln County, Wyoming. EPA monitors recorded a median Air Quality Index of 10 across 181 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 177 (98%) fell in the Good band (AQI 0–50), 4 (2%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 23, while the worst single-day peak hit 77 (Moderate). Residents averaged about 29.3 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM10 (181 days). Across the 2020–2025 trend window, good days shifted by -180 and the median AQI moved -5 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 77, moderate 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
97.8%
177 of 181 monitored days
22.8pp vs 75% target
Max AQI Recorded
77
Moderate
Health Grade
Excellent
90th-pct AQI 23
Lincoln County, Good days share 97.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Lincoln 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 181 monitored days across EPA AQI categories.
Good
177
98%
Moderate
4
2%
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 Lincoln County.
- PM10 · 181 days · 100.0%
Health Impact Assessment
Excellent
Lincoln County's air quality is rated Excellent based on 97.8% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 97.8% 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 181 of 181 monitored days.
5-Year Air Quality Trend
Air quality is stable in Lincoln County. Best year: 2020 (357 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 357 | 9 | 0 | 0 | 15 | 71 |
| 2021 | 297 | 62 | 6 | 0 | 30 | 126 |
| 2022 | 321 | 43 | 1 | 0 | 43 | 118 |
| 2023 | 298 | 67 | 0 | 0 | 44 | 97 |
| 2024 | 340 | 26 | 0 | 0 | 31 | 77 |
| 2025 | 177 | 4 | 0 | 0 | 10 | 77 |
How does Lincoln County compare?
How Lincoln County compares
Good-day share better than US avg
Lincoln County 97.8%
Albany County, Wyoming 51.9%
US average 76.5%
Median AQI better than US avg
Lincoln County 10
Albany County, Wyoming 50
US average 38
Unhealthy days / yr about average
Lincoln 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 Lincoln County.
Los Alamos County, New Mexico
AQI 10 · 100.0% good
Uinta County, Wyoming
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 Lincoln 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 Lincoln County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Lincoln County with its Wyoming neighbours before drawing a conclusion about the region. All of Wyoming
Based on 181 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 Lincoln County, Wyoming? ▼
Lincoln County has a median Air Quality Index (AQI) of 10, rated "Good." 97.8% of monitored days (177 out of 181) had good air quality in 2025.
What is the main pollutant in Lincoln County? ▼
The primary pollutant in Lincoln County is Coarse Particles (PM10), which was the main AQI driver on 181 days (100% of monitored days). Irritates airways and can aggravate asthma and bronchitis.
How many unhealthy air days does Lincoln County have? ▼
In 2025, Lincoln County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 77.
Is the air quality in Lincoln County getting better or worse? ▼
Air quality in Lincoln County is stable based on 5-year trends (2020-2025). Best year: 2020 with 357 good days. Worst year: 2025 with 177 good days.
What does AQI 10 mean for health? ▼
Lincoln 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 Lincoln County compare to other counties in Wyoming? ▼
Lincoln County has 97.8% 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 Lincoln County? ▼
The 90th percentile AQI for Lincoln County is 23, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 77 (Moderate).
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.