Median AQI
22
Good
Nevada · County air quality · 2025
Douglas County, Nevada
Median AQI 22 (Good). 90.9% of monitored days rated Good, direct from EPA Air Quality System stations.
- 22
- Median AQI
- 90.9%
- Good-air days
- 0
- Unhealthy days
- 78%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Douglas County's air is good on balance, cleaner than most US counties, a median AQI of 22 with 90.9% of 176 monitored days in the Good band, driven mainly by PM2.5.
- 22
- median AQI · Good
- 90.9%
- days rated Good
- PM2.5
- main pollutant
- 78%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 57.
Data updated July 2026
- Good · 160 d · 90.9%
- Moderate · 16 d · 9.1%
How did Douglas County's air break down in 2025?
Across 176 monitored days, 160 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 57 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 176 days monitored. Median AQI: 22 (Good).
Insights: Douglas County, Nevada. EPA monitors recorded a median Air Quality Index of 22 across 176 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 160 (91%) fell in the Good band (AQI 0–50), 16 (9%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 50, while the worst single-day peak hit 57 (Moderate). Residents averaged about 27.3 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (176 days). Across the 2020–2025 trend window, good days shifted by -126 and the median AQI moved +0 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 57, moderate but never Unhealthy. Nearby counties show comparable readings: Carson City (79.3% good, AQI 45); Churchill (81.0% good, AQI 43); Clark (25.6% good, AQI 64); Elko (90.8% good, AQI 19); Lyon (83.9% good, AQI 44); Nye (91.2% good, AQI 24).
Air Quality Summary
Good Days
90.9%
160 of 176 monitored days
15.9pp vs 75% target
Max AQI Recorded
57
Moderate
Health Grade
Excellent
90th-pct AQI 50
Douglas County, Good days share 90.9%
National avg
Share of monitored days at AQI 0-50 (Good band).
Douglas 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 176 monitored days across EPA AQI categories.
Good
160
91%
Moderate
16
9%
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 Douglas County.
- PM2.5 · 176 days · 100.0%
Health Impact Assessment
Excellent
Douglas County's air quality is rated Excellent based on 90.9% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 90.9% of monitored days in 2025, with a median AQI of 22. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 176 of 176 monitored days.
5-Year Air Quality Trend
Air quality is improving in Douglas County. Best year: 2024 (308 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 286 | 63 | 6 | 7 | 22 | 274 |
| 2021 | 279 | 53 | 7 | 20 | 24 | 279 |
| 2022 | 295 | 55 | 1 | 5 | 20 | 195 |
| 2023 | 296 | 63 | 0 | 0 | 28 | 73 |
| 2024 | 308 | 34 | 0 | 0 | 22 | 76 |
| 2025 | 160 | 16 | 0 | 0 | 22 | 57 |
How does Douglas County compare?
How Douglas County compares
Good-day share better than US avg
Douglas County 90.9%
Carson City County, Nevada 79.3%
US average 76.5%
Median AQI better than US avg
Douglas County 22
Carson City County, Nevada 45
US average 38
Unhealthy days / yr about average
Douglas County 0
Carson City County, Nevada 0
US average 0
Other Counties in Nevada
Air quality comparison for nearby counties in Nevada.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Douglas County.
Blaine County, Idaho
AQI 22 · 99.4% good
Cass County, Minnesota
AQI 22 · 94.4% good
Chase County, Kansas
AQI 22 · 88.9% good
Deschutes County, Oregon
AQI 22 · 93.4% good
Franklin County, Idaho
AQI 22 · 95.8% good
Franklin County, Washington
AQI 22 · 93.7% good
What Douglas County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 22 means for exposure. Health guidance
- See how Douglas County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Douglas County with its Nevada neighbours before drawing a conclusion about the region. All of Nevada
Based on 176 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 Douglas County, Nevada? ▼
Douglas County has a median Air Quality Index (AQI) of 22, rated "Good." 90.9% of monitored days (160 out of 176) had good air quality in 2025.
What is the main pollutant in Douglas County? ▼
The primary pollutant in Douglas County is Fine Particles (PM2.5), which was the main AQI driver on 176 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Douglas County have? ▼
In 2025, Douglas County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 57.
Is the air quality in Douglas County getting better or worse? ▼
Air quality in Douglas County is improving based on 5-year trends (2020-2025). Best year: 2024 with 308 good days. Worst year: 2025 with 160 good days.
What does AQI 22 mean for health? ▼
Douglas County's median AQI of 22 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 Douglas County compare to other counties in Nevada? ▼
Douglas County has 90.9% good air days. Nearby counties in Nevada: Carson City (79.3% good), Churchill (81.0% good), Clark (25.6% good), Elko (90.8% good), Lyon (83.9% good), Nye (91.2% good).
What is the 90th percentile AQI in Douglas County? ▼
The 90th percentile AQI for Douglas County is 50, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 57 (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.