Median AQI
39
Good
New York · County air quality · 2025
Chautauqua County, New York
Median AQI 39 (Good). 88.6% of monitored days rated Good, direct from EPA Air Quality System stations.
- 39
- Median AQI
- 88.6%
- Good-air days
- 0
- Unhealthy days
- 73%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Chautauqua County's air is good on balance, cleaner than the median US county, a median AQI of 39 with 88.6% of 263 monitored days in the Good band, driven mainly by Ozone.
- 39
- median AQI · Good
- 88.6%
- days rated Good
- Ozone
- main pollutant
- 73%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 108.
Data updated July 2026
- Good · 233 d · 88.6%
- Moderate · 29 d · 11.0%
- USG · 1 d · 0.4%
How did Chautauqua County's air break down in 2025?
Across 263 monitored days, 233 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 108 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 263 days monitored. Median AQI: 39 (Good).
Insights: Chautauqua County, New York. EPA monitors recorded a median Air Quality Index of 39 across 263 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 233 (89%) fell in the Good band (AQI 0–50), 29 (11%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 52, while the worst single-day peak hit 108 (USG). Residents averaged about 26.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (254 days), PM2.5 (9 days). Across the 2020–2025 trend window, good days shifted by -99 and the median AQI moved +3 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 108, usg but never Unhealthy. Nearby counties show comparable readings: Albany (67.4% good, AQI 39); Bronx (56.6% good, AQI 47); Dutchess (92.7% good, AQI 37); Erie (61.3% good, AQI 44); Essex (79.8% good, AQI 42); Hamilton (96.6% good, AQI 36).
Air Quality Summary
Good Days
88.6%
233 of 263 monitored days
13.6pp vs 75% target
Max AQI Recorded
108
USG
Health Grade
Good
90th-pct AQI 52
Chautauqua County, Good days share 88.6%
National avg
Share of monitored days at AQI 0-50 (Good band).
Chautauqua 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 263 monitored days across EPA AQI categories.
Good
233
89%
Moderate
29
11%
USG
1
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 Chautauqua County.
- Ozone · 254 days · 96.6%
- PM2.5 · 9 days · 3.4%
Health Impact Assessment
Good
Chautauqua County's air quality is rated Good based on 88.6% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 88.6% of monitored days in 2025, with a median AQI of 39. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 254 of 263 monitored days.
5-Year Air Quality Trend
Air quality is stable in Chautauqua County. Best year: 2020 (332 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 332 | 31 | 0 | 0 | 36 | 93 |
| 2021 | 300 | 60 | 1 | 0 | 38 | 105 |
| 2022 | 322 | 29 | 4 | 0 | 36 | 140 |
| 2023 | 322 | 36 | 5 | 0 | 37 | 133 |
| 2024 | 326 | 36 | 1 | 0 | 36 | 105 |
| 2025 | 233 | 29 | 1 | 0 | 39 | 108 |
How does Chautauqua County compare?
How Chautauqua County compares
Good-day share better than US avg
Chautauqua County 88.6%
Albany County, New York 67.4%
US average 76.5%
Median AQI worse than US avg
Chautauqua County 39
Albany County, New York 39
US average 38
Unhealthy days / yr about average
Chautauqua County 0
Albany County, New York 0
US average 0
Other Counties in New York
Air quality comparison for nearby counties in New York.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Chautauqua County.
Ada County, Idaho
AQI 39 · 80.6% good
Aiken County, South Carolina
AQI 39 · 89.1% good
Albany County, New York
AQI 39 · 67.4% good
Alexander County, North Carolina
AQI 39 · 92.4% good
Ashland County, Wisconsin
AQI 39 · 85.6% good
Bennington County, Vermont
AQI 39 · 82.9% good
What Chautauqua 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 39 means for exposure. Health guidance
- See how Chautauqua County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Chautauqua County with its New York neighbours before drawing a conclusion about the region. All of New York
Based on 263 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 Chautauqua County, New York? ▼
Chautauqua County has a median Air Quality Index (AQI) of 39, rated "Good." 88.6% of monitored days (233 out of 263) had good air quality in 2025.
What is the main pollutant in Chautauqua County? ▼
The primary pollutant in Chautauqua County is Ozone (O3), which was the main AQI driver on 254 days (97% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Chautauqua County have? ▼
In 2025, Chautauqua County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.
Is the air quality in Chautauqua County getting better or worse? ▼
Air quality in Chautauqua County is stable based on 5-year trends (2020-2025). Best year: 2020 with 332 good days. Worst year: 2025 with 233 good days.
What does AQI 39 mean for health? ▼
Chautauqua County's median AQI of 39 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 Chautauqua County compare to other counties in New York? ▼
Chautauqua County has 88.6% good air days. Nearby counties in New York: Albany (67.4% good), Bronx (56.6% good), Dutchess (92.7% good), Erie (61.3% good), Essex (79.8% good), Hamilton (96.6% good).
What is the 90th percentile AQI in Chautauqua County? ▼
The 90th percentile AQI for Chautauqua County is 52, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 108 (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.