Oklahoma · County air quality · 2025
Adair County, Oklahoma
Median AQI 48 (Good). 55.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 48
- Median AQI
- 55.8%
- Good-air days
- 2
- Unhealthy days
- 10%
- Cleaner than US counties
Adair County's 2025 annual median AQI is 48 (Good), with 55.8% Good days
According to the U.S. EPA Air Quality System, Adair County, Oklahoma posted a 2025 median AQI of 48 (Good) across 362 monitored days, with 55.8% rated Good and 2 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Adair County's 55.8% Good-day share places it cleaner than 10% of US counties in 2025.
- Closest median-AQI peer
- Arapahoe County (58.1% Good, median AQI 48) is the closest nationwide median-AQI peer to Adair County.
- 2020–2025 trend
- Adair County's floor-qualifying Good-day share is worsening from 2020 to 2025 (81.8% → 55.8%).
- Median AQI
- Median AQI: 48
According to the 2025 EPA AQS county release on PlainAirData, Adair County, Oklahoma ranks #843 of 951 by median AQI (48) and #853 by good-day share (55.8%). Ponce County, Puerto Rico is #1 of 951 by median AQI (3, 91.4% Good days) at good-day-share #159 ≠ largest of 7 at 100.0% Good days #1 by good-day share (100.0%, median AQI 9) at median-AQI #7.
Annual release change
What changed in the 2025 EPA annual release
- Adair County's peak single-day AQI rose from 138 to 184 between the 2024 and 2025 EPA annual releases, a change of +46 points.
- Adair County's Unhealthy-category days rose from 0 to 2 between the 2024 and 2025 EPA annual releases, a change of +2 days.
- Adair County's Good-day share fell from 57.1% to 55.8% between the 2024 and 2025 EPA annual releases, a change of -1.3 percentage points.
Data updated August 2026
- Good · 202 d · 55.8%
- Moderate · 158 d · 43.6%
- Unhealthy · 2 d · 0.6%
How did Adair County's air break down in 2025?
Across 362 monitored days, 202 fell in the Good band (AQI 0–50) and 2 reached Unhealthy or worse. The worst single day peaked at AQI 184 (Unhealthy).
EPA AQS →Share of monitored days at AQI 0-50 (Good band).
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
Where Adair County sits nationally
COUNT-derived placement among 951 US counties with at least 100 monitored days in 2025. Adair County's Good-day share is 55.8% - cleaner than 10% of that comparison set.
Adair County Good-day share vs. every US county
Share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release
55.8% 10th percentile higher than 10% of 951 US counties
Each bar is a band; taller bars hold more US counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2025
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Adair County.
- PM2.5 · 227 days · 62.7%
- Ozone · 132 days · 36.5%
- PM10 · 3 days · 0.8%
2024 daily-monitor rhythm in Adair County
Month-by-month median AQI from EPA day-level county monitors (366 reported days in 2024). Jul posted the highest typical readings (median AQI 54, peak 70); Nov was cleanest at median 35. Summer months (Jun–Aug) averaged median AQI 52 vs 43 in Dec–Feb.
Five-year seasonal record
EPA day-level county files · 2020–20241,820 daily readings show a recurring local pattern: Jun has the highest matched-month median AQI (49), while Nov is lowest (38). Each cell is that month’s median daily AQI, not a current-air forecast.
Lower AQI is better. The colors summarize EPA AQI bands; gaps mean the county had no day-level record for that month.
Health Impact Assessment
Adair County's air quality is rated Moderate based on 55.8% good air days. There were 2 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 0 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 184. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is PM2.5, driving AQI on 227 of 362 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Adair County. Highest Good-day share: 2020 (81.8%, 297 of 363 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 297 | 65 | 0 | 1 | 36 | 152 |
| 2021 | 291 | 73 | 1 | 0 | 40 | 117 |
| 2022 | 274 | 83 | 4 | 0 | 43 | 122 |
| 2023 | 172 | 193 | 0 | 0 | 51 | 100 |
| 2024 | 209 | 153 | 4 | 0 | 47 | 138 |
| 2025 | 202 | 158 | 0 | 2 | 48 | 184 |
How does Adair County compare?
How Adair County compares
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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Adair County, Oklahoma · 2020–2025
Download this county's annual AQI row as CSV , with the same EPA fields and denominator shown on this page.
Every figure on PlainAirData 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.