Median AQI
43
Good
Kansas · County air quality · 2025
Neosho County, Kansas
Median AQI 43 (Good). 73.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 43
- Median AQI
- 73.5%
- Good-air days
- 1
- Unhealthy days
- 38%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Neosho County's air is good on balance, more polluted than the median US county, a median AQI of 43 with 73.5% of 181 monitored days in the Good band, driven mainly by Ozone.
- 43
- median AQI · Good
- 73.5%
- days rated Good
- Ozone
- main pollutant
- 38%
- cleaner than US counties
1 day reached Unhealthy or worse; the worst single reading hit AQI 315.
Data updated July 2026
- Good · 133 d · 73.5%
- Moderate · 46 d · 25.4%
- USG · 1 d · 0.6%
- Hazardous · 1 d · 0.6%
How did Neosho County's air break down in 2025?
Across 181 monitored days, 133 fell in the Good band (AQI 0–50) and 1 reached Unhealthy or worse. The worst single day peaked at AQI 315 (Hazardous).
EPA AQS →Air quality data from EPA Air Quality System (2025). 181 days monitored. Median AQI: 43 (Good).
Insights: Neosho County, Kansas. EPA monitors recorded a median Air Quality Index of 43 across 181 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 133 (73%) fell in the Good band (AQI 0–50), 46 (25%) registered Moderate readings, and 1 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 58, while the worst single-day peak hit 315 (Hazardous). Residents averaged about 22.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (104 days), PM2.5 (72 days), PM10 (5 days). Across the 2020–2025 trend window, good days shifted by -102 and the median AQI moved -1 points, placing the multi-year trajectory at improving. Residents and visitors experienced 1 unhealthy-or-worse days combined, periods when the EPA recommends sensitive groups limit prolonged outdoor exertion. 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); Leavenworth (93.9% good, AQI 36); Sedgwick (58.6% good, AQI 48).
Air Quality Summary
Good Days
73.5%
133 of 181 monitored days
-1.5pp vs 75% target
Max AQI Recorded
315
Hazardous
Health Grade
Moderate
90th-pct AQI 58
Neosho County, Good days share 73.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Neosho County, Unhealthy-or-worse share 0.6%
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
133
73%
Moderate
46
25%
USG
1
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
1
1%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Neosho County.
- Ozone · 104 days · 57.5%
- PM2.5 · 72 days · 39.8%
- PM10 · 5 days · 2.8%
Health Impact Assessment
Moderate
Neosho County's air quality is rated Moderate based on 73.5% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality posed significant health risk in 2025. Sensitive groups, including people with asthma, COPD, cardiovascular conditions, children, pregnant women, and adults over 65, should monitor AirNow.gov alerts and limit outdoor activity on Unhealthy (AQI 151+) and Very Unhealthy (201+) days. Peak readings reached AQI 315, well into the Hazardous range.
Sensitive group advisory
People with asthma, COPD, heart disease, children, pregnant women, and adults 65+ should follow EPA AQI alerts daily and limit outdoor exertion when AQI exceeds 100. Real-time conditions: airnow.gov.
The dominant pollutant is Ozone, driving AQI on 104 of 181 monitored days.
5-Year Air Quality Trend
Air quality is improving in Neosho County. Best year: 2024 (247 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 235 | 129 | 2 | 0 | 44 | 106 |
| 2021 | 171 | 189 | 2 | 0 | 51 | 145 |
| 2022 | 201 | 159 | 0 | 0 | 48 | 94 |
| 2023 | 147 | 215 | 1 | 2 | 54 | 161 |
| 2024 | 247 | 116 | 2 | 1 | 44 | 168 |
| 2025 | 133 | 46 | 1 | 0 | 43 | 315 |
How does Neosho County compare?
How Neosho County compares
Good-day share worse than US avg
Neosho County 73.5%
Chase County, Kansas 88.9%
US average 76.5%
Median AQI worse than US avg
Neosho County 43
Chase County, Kansas 22
US average 38
Unhealthy days / yr worse than US avg
Neosho County 1
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 Neosho County.
Allegan County, Michigan
AQI 43 · 71.2% good
Allen County, Ohio
AQI 43 · 65.9% good
Ashtabula County, Ohio
AQI 43 · 81.2% good
Bell County, Kentucky
AQI 43 · 63.5% good
Boise County, Idaho
AQI 43 · 72.9% good
Brazos County, Texas
AQI 43 · 63.4% good
What Neosho County's air means for you
On most days the air here is fine, but Ozone drives 1 unhealthy-or-worse day a year that sensitive groups should plan around.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 43 means for exposure. Health guidance
- See how Neosho County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Neosho County with its Kansas neighbours before drawing a conclusion about the region. All of Kansas
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 Neosho County, Kansas? ▼
Neosho County has a median Air Quality Index (AQI) of 43, rated "Good." 73.5% of monitored days (133 out of 181) had good air quality in 2025.
What is the main pollutant in Neosho County? ▼
The primary pollutant in Neosho County is Ozone (O3), which was the main AQI driver on 104 days (57% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Neosho County have? ▼
In 2025, Neosho County recorded 1 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 1 Hazardous). The maximum AQI reached 315.
Is the air quality in Neosho County getting better or worse? ▼
Air quality in Neosho County is improving based on 5-year trends (2020-2025). Best year: 2024 with 247 good days. Worst year: 2025 with 133 good days.
What does AQI 43 mean for health? ▼
Neosho County's median AQI of 43 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 Neosho County compare to other counties in Kansas? ▼
Neosho County has 73.5% good air days. Nearby counties in Kansas: Chase (88.9% good), Douglas (90.7% good), Ford (89.4% good), Johnson (71.8% good), Leavenworth (93.9% good), Sedgwick (58.6% good).
What is the 90th percentile AQI in Neosho County? ▼
The 90th percentile AQI for Neosho County is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 315 (Hazardous).
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.