Median AQI
40
Good
Oklahoma · County air quality · 2025
Mayes County, Oklahoma
Median AQI 40 (Good). 89.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 40
- Median AQI
- 89.4%
- Good-air days
- 0
- Unhealthy days
- 75%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Mayes County's air is good on balance, cleaner than most US counties, a median AQI of 40 with 89.4% of 123 monitored days in the Good band, driven mainly by Ozone.
- 40
- median AQI · Good
- 89.4%
- days rated Good
- Ozone
- main pollutant
- 75%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 87.
Data updated July 2026
- Good · 110 d · 89.4%
- Moderate · 13 d · 10.6%
How did Mayes County's air break down in 2025?
Across 123 monitored days, 110 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 87 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 123 days monitored. Median AQI: 40 (Good).
Insights: Mayes County, Oklahoma. EPA monitors recorded a median Air Quality Index of 40 across 123 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 110 (89%) fell in the Good band (AQI 0–50), 13 (11%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 51, while the worst single-day peak hit 87 (Moderate). Residents averaged about 26.8 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (123 days). Across the 2020–2025 trend window, good days shifted by -145 and the median AQI moved +6 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 87, moderate but never Unhealthy. Nearby counties show comparable readings: Adair (59.2% good, AQI 45); Canadian (78.0% good, AQI 44); Carter (80.9% good, AQI 33); Cleveland (53.7% good, AQI 49); Comanche (63.8% good, AQI 45); Creek (80.1% good, AQI 43).
Air Quality Summary
Good Days
89.4%
110 of 123 monitored days
14.4pp vs 75% target
Max AQI Recorded
87
Moderate
Health Grade
Good
90th-pct AQI 51
Mayes County, Good days share 89.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Mayes 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 123 monitored days across EPA AQI categories.
Good
110
89%
Moderate
13
11%
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 Mayes County.
- Ozone · 123 days · 100.0%
Health Impact Assessment
Good
Mayes County's air quality is rated Good based on 89.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 89.4% of monitored days in 2025, with a median AQI of 40. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 123 of 123 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Mayes County. Best year: 2024 (261 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 255 | 3 | 0 | 0 | 34 | 51 |
| 2021 | 228 | 20 | 0 | 0 | 37 | 100 |
| 2022 | 246 | 19 | 1 | 0 | 39 | 112 |
| 2023 | 255 | 28 | 2 | 0 | 42 | 129 |
| 2024 | 261 | 28 | 1 | 0 | 40 | 112 |
| 2025 | 110 | 13 | 0 | 0 | 40 | 87 |
How does Mayes County compare?
How Mayes County compares
Good-day share better than US avg
Mayes County 89.4%
Adair County, Oklahoma 59.2%
US average 76.5%
Median AQI worse than US avg
Mayes County 40
Adair County, Oklahoma 45
US average 38
Unhealthy days / yr about average
Mayes County 0
Adair County, Oklahoma 2
US average 0
Other Counties in Oklahoma
Air quality comparison for nearby counties in Oklahoma.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Mayes County.
Amador County, California
AQI 40 · 84.8% good
Anne Arundel County, Maryland
AQI 40 · 87.2% good
Arlington County, Virginia
AQI 40 · 84.8% good
Bergen County, New Jersey
AQI 40 · 71.1% good
Berkeley County, West Virginia
AQI 40 · 81.1% good
Billings County, North Dakota
AQI 40 · 80.3% good
What Mayes 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 40 means for exposure. Health guidance
- See how Mayes County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Mayes County with its Oklahoma neighbours before drawing a conclusion about the region. All of Oklahoma
Based on 123 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 Mayes County, Oklahoma? ▼
Mayes County has a median Air Quality Index (AQI) of 40, rated "Good." 89.4% of monitored days (110 out of 123) had good air quality in 2025.
What is the main pollutant in Mayes County? ▼
The primary pollutant in Mayes County is Ozone (O3), which was the main AQI driver on 123 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Mayes County have? ▼
In 2025, Mayes County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 87.
Is the air quality in Mayes County getting better or worse? ▼
Air quality in Mayes County is worsening based on 5-year trends (2020-2025). Best year: 2024 with 261 good days. Worst year: 2025 with 110 good days.
What does AQI 40 mean for health? ▼
Mayes County's median AQI of 40 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 Mayes County compare to other counties in Oklahoma? ▼
Mayes County has 89.4% good air days. Nearby counties in Oklahoma: Adair (59.2% good), Canadian (78.0% good), Carter (80.9% good), Cleveland (53.7% good), Comanche (63.8% good), Creek (80.1% good).
What is the 90th percentile AQI in Mayes County? ▼
The 90th percentile AQI for Mayes County is 51, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 87 (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.