Median AQI
41
Good
Kansas · County air quality · 2025
Douglas County, Kansas
Median AQI 41 (Good). 90.7% of monitored days rated Good, direct from EPA Air Quality System stations.
- 41
- Median AQI
- 90.7%
- Good-air days
- 0
- Unhealthy days
- 77%
- 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 41 with 90.7% of 162 monitored days in the Good band, driven mainly by Ozone.
- 41
- median AQI · Good
- 90.7%
- days rated Good
- Ozone
- main pollutant
- 77%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 101.
Data updated July 2026
- Good · 147 d · 90.7%
- Moderate · 14 d · 8.6%
- USG · 1 d · 0.6%
How did Douglas County's air break down in 2025?
Across 162 monitored days, 147 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 101 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 162 days monitored. Median AQI: 41 (Good).
Insights: Douglas County, Kansas. EPA monitors recorded a median Air Quality Index of 41 across 162 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 147 (91%) fell in the Good band (AQI 0–50), 14 (9%) registered Moderate readings, and 1 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 50, while the worst single-day peak hit 101 (USG). Residents averaged about 27.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (162 days). Across the 2025–2025 trend window, good days shifted by +0 and the median AQI moved +0 points, placing the multi-year trajectory at tracked. The worst single reading over the 2025–2025 window was AQI 101, usg but never Unhealthy. Nearby counties show comparable readings: Chase (88.9% good, AQI 22); Ford (89.4% good, AQI 26); Johnson (71.8% good, AQI 43); Leavenworth (93.9% good, AQI 36); Neosho (73.5% good, AQI 43); Sedgwick (58.6% good, AQI 48).
Air Quality Summary
Good Days
90.7%
147 of 162 monitored days
15.7pp vs 75% target
Max AQI Recorded
101
USG
Health Grade
Excellent
90th-pct AQI 50
Douglas County, Good days share 90.7%
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 162 monitored days across EPA AQI categories.
Good
147
91%
Moderate
14
9%
USG
1
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 Douglas County.
- Ozone · 162 days · 100.0%
Health Impact Assessment
Excellent
Douglas County's air quality is rated Excellent based on 90.7% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 90.7% of monitored days in 2025, with a median AQI of 41. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 162 of 162 monitored days.
How does Douglas County compare?
How Douglas County compares
Good-day share better than US avg
Douglas County 90.7%
Chase County, Kansas 88.9%
US average 76.5%
Median AQI worse than US avg
Douglas County 41
Chase County, Kansas 22
US average 38
Unhealthy days / yr about average
Douglas County 0
Chase County, Kansas 0
US average 0
Other Counties in Kansas
Air quality comparison for nearby counties in Kansas.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Douglas County.
Albemarle County, Virginia
AQI 41 · 77.9% good
Anderson County, South Carolina
AQI 41 · 90.0% good
Berkshire County, Massachusetts
AQI 41 · 71.6% good
Berrien County, Michigan
AQI 41 · 80.9% good
Blair County, Pennsylvania
AQI 41 · 71.9% good
Bonner County, Idaho
AQI 41 · 71.3% good
What Douglas 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 41 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 Kansas neighbours before drawing a conclusion about the region. All of Kansas
Based on 162 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, Kansas? ▼
Douglas County has a median Air Quality Index (AQI) of 41, rated "Good." 90.7% of monitored days (147 out of 162) had good air quality in 2025.
What is the main pollutant in Douglas County? ▼
The primary pollutant in Douglas County is Ozone (O3), which was the main AQI driver on 162 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
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 101.
Is the air quality in Douglas County getting better or worse? ▼
Insufficient trend data is available for Douglas County.
What does AQI 41 mean for health? ▼
Douglas County's median AQI of 41 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 Kansas? ▼
Douglas County has 90.7% good air days. Nearby counties in Kansas: Chase (88.9% good), Ford (89.4% good), Johnson (71.8% good), Leavenworth (93.9% good), Neosho (73.5% good), Sedgwick (58.6% 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 101 (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.