Median AQI
36
Good
Kansas · County air quality · 2025
Leavenworth County, Kansas
Median AQI 36 (Good). 93.9% of monitored days rated Good, direct from EPA Air Quality System stations.
- 36
- Median AQI
- 93.9%
- Good-air days
- 0
- Unhealthy days
- 85%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Leavenworth County's air is good on balance, cleaner than most US counties, a median AQI of 36 with 93.9% of 180 monitored days in the Good band, driven mainly by Ozone.
- 36
- median AQI · Good
- 93.9%
- days rated Good
- Ozone
- main pollutant
- 85%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 97.
Data updated July 2026
- Good · 169 d · 93.9%
- Moderate · 11 d · 6.1%
How did Leavenworth County's air break down in 2025?
Across 180 monitored days, 169 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 97 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 180 days monitored. Median AQI: 36 (Good).
Insights: Leavenworth County, Kansas. EPA monitors recorded a median Air Quality Index of 36 across 180 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 169 (94%) fell in the Good band (AQI 0–50), 11 (6%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 49, while the worst single-day peak hit 97 (Moderate). Residents averaged about 28.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (180 days). Across the 2020–2025 trend window, good days shifted by -187 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 97, moderate but never Unhealthy. Nearby counties show comparable readings: Chase (88.9% good, AQI 22); Douglas (90.7% good, AQI 41); Ford (89.4% good, AQI 26); Johnson (71.8% good, AQI 43); Neosho (73.5% good, AQI 43); Sedgwick (58.6% good, AQI 48).
Air Quality Summary
Good Days
93.9%
169 of 180 monitored days
18.9pp vs 75% target
Max AQI Recorded
97
Moderate
Health Grade
Excellent
90th-pct AQI 49
Leavenworth County, Good days share 93.9%
National avg
Share of monitored days at AQI 0-50 (Good band).
Leavenworth 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 180 monitored days across EPA AQI categories.
Good
169
94%
Moderate
11
6%
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 Leavenworth County.
- Ozone · 180 days · 100.0%
Health Impact Assessment
Excellent
Leavenworth County's air quality is rated Excellent based on 93.9% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 93.9% of monitored days in 2025, with a median AQI of 36. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 180 of 180 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Leavenworth County. Best year: 2020 (356 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 356 | 10 | 0 | 0 | 32 | 77 |
| 2021 | 330 | 16 | 2 | 0 | 34 | 126 |
| 2022 | 341 | 24 | 0 | 0 | 37 | 80 |
| 2023 | 303 | 51 | 10 | 0 | 37 | 129 |
| 2024 | 327 | 21 | 0 | 0 | 36 | 97 |
| 2025 | 169 | 11 | 0 | 0 | 36 | 97 |
How does Leavenworth County compare?
How Leavenworth County compares
Good-day share better than US avg
Leavenworth County 93.9%
Chase County, Kansas 88.9%
US average 76.5%
Median AQI better than US avg
Leavenworth County 36
Chase County, Kansas 22
US average 38
Unhealthy days / yr about average
Leavenworth 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 Leavenworth County.
Aroostook County, Maine
AQI 36 · 84.1% good
Berkeley County, South Carolina
AQI 36 · 92.2% good
Carter County, Kentucky
AQI 36 · 89.8% good
Claiborne County, Tennessee
AQI 36 · 96.3% good
Clark County, Illinois
AQI 36 · 92.1% good
Cobb County, Georgia
AQI 36 · 92.5% good
What Leavenworth 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 36 means for exposure. Health guidance
- See how Leavenworth County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Leavenworth County with its Kansas neighbours before drawing a conclusion about the region. All of Kansas
Based on 180 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 Leavenworth County, Kansas? ▼
Leavenworth County has a median Air Quality Index (AQI) of 36, rated "Good." 93.9% of monitored days (169 out of 180) had good air quality in 2025.
What is the main pollutant in Leavenworth County? ▼
The primary pollutant in Leavenworth County is Ozone (O3), which was the main AQI driver on 180 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Leavenworth County have? ▼
In 2025, Leavenworth County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 97.
Is the air quality in Leavenworth County getting better or worse? ▼
Air quality in Leavenworth County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 356 good days. Worst year: 2025 with 169 good days.
What does AQI 36 mean for health? ▼
Leavenworth County's median AQI of 36 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 Leavenworth County compare to other counties in Kansas? ▼
Leavenworth County has 93.9% good air days. Nearby counties in Kansas: Chase (88.9% good), Douglas (90.7% good), Ford (89.4% good), Johnson (71.8% good), Neosho (73.5% good), Sedgwick (58.6% good).
What is the 90th percentile AQI in Leavenworth County? ▼
The 90th percentile AQI for Leavenworth County is 49, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 97 (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.