Median AQI
22
Good
Nevada · County air quality · 2025
Douglas County, Nevada
Median AQI 22 (Good). 91.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 22
- Median AQI
- 91.1%
- Good-air days
- 0
- Unhealthy days
- 82%
- Cleaner than US counties
Douglas County's 2025 annual median AQI is 22 (Good), with 91.1% Good days
According to the U.S. EPA Air Quality System, Douglas County, Nevada posted a 2025 median AQI of 22 (Good) across 358 monitored days, with 91.1% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Douglas County's 91.1% Good-day share places it cleaner than 82% of US counties in 2025.
- Closest median-AQI peer
- Bonneville County (93.0% Good, median AQI 22) is the closest nationwide median-AQI peer to Douglas County.
- 2020–2025 trend
- Douglas County's floor-qualifying Good-day share is improving from 2020 to 2025 (79.0% → 91.1%).
- Median AQI
- Median AQI: 22
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 91.1% of 358 monitored days in the Good band, driven mainly by PM2.5.
- 22
- median AQI · Good
- 91.1%
- days rated Good
- PM2.5
- main pollutant
- 82%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 63.
Annual release change
What changed in the 2025 EPA annual release
- Douglas County's peak single-day AQI fell from 76 to 63 between the 2024 and 2025 EPA annual releases, a change of -13 points.
- Douglas County's Good-day share rose from 90.1% to 91.1% between the 2024 and 2025 EPA annual releases, a change of +1.0 percentage points.
Data updated August 2026
- Good · 326 d · 91.1%
- Moderate · 32 d · 8.9%
How did Douglas County's air break down in 2025?
Across 358 monitored days, 326 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 63 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 358 days monitored. Median AQI: 22 (Good).
Insights: Douglas County, Nevada. EPA monitors recorded a median Air Quality Index of 22 across 358 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 326 (91%) fell in the Good band (AQI 0–50), 32 (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 63 (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 (358 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +12.9 points 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 63, moderate but never Unhealthy. Nearby counties show comparable readings: Carson City (86.2% good, AQI 42); Churchill (85.2% good, AQI 40); Clark (31.0% good, AQI 61); Elko (86.3% good, AQI 42); Lyon (90.0% good, AQI 41); Nye (92.6% good, AQI 26).
Air Quality Summary
Good Days
91.1%
326 of 358 monitored days
16.1pp vs 75% target
Max AQI Recorded
63
Moderate
Health Grade
Excellent
90th-pct AQI 50
Douglas County, Good days share 91.1%
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 358 monitored days across EPA AQI categories.
Good
326
91%
Moderate
32
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 · 358 days · 100.0%
Health Impact Assessment
Excellent
Douglas County's air quality is rated Excellent based on 91.1% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 91.1% 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 358 of 358 monitored days.
5-Year Air Quality Trend
Air quality is improving in Douglas County. Highest Good-day share: 2025 (91.1%, 326 of 358 monitored 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 | 326 | 32 | 0 | 0 | 22 | 63 |
How does Douglas County compare?
How Douglas County compares
Good-day share better than typical
Douglas County 91.1%
Bonneville County, Idaho 93.0%
Typical US county 76.0%
Median AQI better than typical
Douglas County 22
Bonneville County, Idaho 22
Typical US county 39
Unhealthy days / yr better than typical
Douglas County 0
Bonneville County, Idaho 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Douglas County (22), not geographic neighbors.
Bonneville County, Idaho
Median AQI 22 · 93.0% Good-day share
Cowlitz County, Washington
Median AQI 22 · 90.4% Good-day share
Grays Harbor County, Washington
Median AQI 22 · 97.3% Good-day share
Kitsap County, Washington
Median AQI 22 · 95.5% Good-day share
Routt County, Colorado
Median AQI 22 · 93.7% Good-day share
Susquehanna County, Pennsylvania
Median AQI 22 · 88.4% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Lewis County, Washington
91.3% Good-day share · median AQI 20
Phillips County, Montana
91.4% Good-day share · median AQI 19
Ponce County, Puerto Rico
91.4% Good-day share · median AQI 3
Matanuska-Susitna County, Alaska
91.5% Good-day share · median AQI 9
Alamosa County, Colorado
91.5% Good-day share · median AQI 25
Adams County, Washington
90.5% Good-day share · median AQI 21
Nevada counties on the map
Geographic containment only, other monitored counties in Nevada, independent of AQI or pollutant match.
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 358 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
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." 91.1% of monitored days (326 out of 358) 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 358 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 63.
Is the air quality in Douglas County getting better or worse? ▼
Air quality in Douglas County is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2025 at 91.1% (326 of 358 days). Lowest qualifying Good-day share: 2021 at 77.7% (279 of 365 days).
What does AQI 22 mean for health? ▼
Douglas County's median AQI of 22 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Douglas County compare to other counties in Nevada? ▼
Douglas County has 91.1% good air days. Nearby counties in Nevada: Carson City (86.2% good), Churchill (85.2% good), Clark (31.0% good), Elko (86.3% good), Lyon (90.0% good), Nye (92.6% 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 63 (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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Douglas County, Nevada · 2020–2025
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Every figure on PlainAirData 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.