Median AQI
49
Good
Oklahoma · County air quality · 2025
Cleveland County, Oklahoma
Median AQI 49 (Good). 53.7% of monitored days rated Good, direct from EPA Air Quality System stations.
- 49
- Median AQI
- 53.7%
- Good-air days
- 0
- Unhealthy days
- 9%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Cleveland County's air is good on balance, among the most polluted counties nationally, a median AQI of 49 with 53.7% of 272 monitored days in the Good band, driven mainly by Ozone.
- 49
- median AQI · Good
- 53.7%
- days rated Good
- Ozone
- main pollutant
- 9%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 130.
Data updated July 2026
- Good · 146 d · 53.7%
- Moderate · 123 d · 45.2%
- USG · 3 d · 1.1%
How did Cleveland County's air break down in 2025?
Across 272 monitored days, 146 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 130 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 272 days monitored. Median AQI: 49 (Good).
Insights: Cleveland County, Oklahoma. EPA monitors recorded a median Air Quality Index of 49 across 272 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 146 (54%) fell in the Good band (AQI 0–50), 123 (45%) registered Moderate readings, and 3 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 67, while the worst single-day peak hit 130 (USG). Residents averaged about 16.1 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (136 days), PM2.5 (136 days). Across the 2020–2025 trend window, good days shifted by -29 and the median AQI moved -2 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 130, usg 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); Comanche (63.8% good, AQI 45); Creek (80.1% good, AQI 43); Dewey (56.6% good, AQI 49).
Air Quality Summary
Good Days
53.7%
146 of 272 monitored days
-21.3pp vs 75% target
Max AQI Recorded
130
USG
Health Grade
Moderate
90th-pct AQI 67
Cleveland County, Good days share 53.7%
National avg
Share of monitored days at AQI 0-50 (Good band).
Cleveland 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 272 monitored days across EPA AQI categories.
Good
146
54%
Moderate
123
45%
USG
3
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 Cleveland County.
- PM2.5 · 136 days · 50.0%
- Ozone · 136 days · 50.0%
Health Impact Assessment
Moderate
Cleveland County's air quality is rated Moderate based on 53.7% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 53.7% of monitored days in 2025, with a median AQI of 49. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 136 of 272 monitored days.
5-Year Air Quality Trend
Air quality is improving in Cleveland County. Best year: 2022 (182 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 175 | 177 | 2 | 0 | 51 | 121 |
| 2021 | 144 | 215 | 3 | 0 | 53 | 129 |
| 2022 | 182 | 162 | 4 | 0 | 49 | 105 |
| 2023 | 163 | 188 | 4 | 0 | 52 | 143 |
| 2024 | 177 | 173 | 9 | 0 | 51 | 126 |
| 2025 | 146 | 123 | 3 | 0 | 49 | 130 |
How does Cleveland County compare?
How Cleveland County compares
Good-day share worse than US avg
Cleveland County 53.7%
Adair County, Oklahoma 59.2%
US average 76.5%
Median AQI worse than US avg
Cleveland County 49
Adair County, Oklahoma 45
US average 38
Unhealthy days / yr about average
Cleveland 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 Cleveland County.
Allegheny County, Pennsylvania
AQI 49 · 51.6% good
Arkansas County, Arkansas
AQI 49 · 51.6% good
Ashley County, Arkansas
AQI 49 · 53.9% good
Clayton County, Georgia
AQI 49 · 53.1% good
Dewey County, Oklahoma
AQI 49 · 56.6% good
Douglas County, Colorado
AQI 49 · 57.9% good
What Cleveland 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 49 means for exposure. Health guidance
- See how Cleveland County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Cleveland County with its Oklahoma neighbours before drawing a conclusion about the region. All of Oklahoma
Based on 272 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 Cleveland County, Oklahoma? ▼
Cleveland County has a median Air Quality Index (AQI) of 49, rated "Good." 53.7% of monitored days (146 out of 272) had good air quality in 2025.
What is the main pollutant in Cleveland County? ▼
The primary pollutant in Cleveland County is Ozone (O3), which was the main AQI driver on 136 days (50% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Cleveland County have? ▼
In 2025, Cleveland County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 130.
Is the air quality in Cleveland County getting better or worse? ▼
Air quality in Cleveland County is improving based on 5-year trends (2020-2025). Best year: 2022 with 182 good days. Worst year: 2021 with 144 good days.
What does AQI 49 mean for health? ▼
Cleveland County's median AQI of 49 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 Cleveland County compare to other counties in Oklahoma? ▼
Cleveland County has 53.7% good air days. Nearby counties in Oklahoma: Adair (59.2% good), Canadian (78.0% good), Carter (80.9% good), Comanche (63.8% good), Creek (80.1% good), Dewey (56.6% good).
What is the 90th percentile AQI in Cleveland County? ▼
The 90th percentile AQI for Cleveland County is 67, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 130 (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.