Median AQI
46
Good
Georgia · County air quality · 2025
Clarke County, Georgia
Median AQI 46 (Good). 57.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 46
- Median AQI
- 57.8%
- Good-air days
- 0
- Unhealthy days
- 12%
- Cleaner than US counties
Clarke County's 2025 annual median AQI is 46 (Good), with 57.8% Good days
According to the U.S. EPA Air Quality System, Clarke County, Georgia posted a 2025 median AQI of 46 (Good) across 365 monitored days, with 57.8% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Clarke County's 57.8% Good-day share places it cleaner than 12% of US counties in 2025.
- Closest median-AQI peer
- Beaver County (55.6% Good, median AQI 46) is the closest nationwide median-AQI peer to Clarke County.
- 2020–2025 trend
- Clarke County's floor-qualifying Good-day share is worsening from 2020 to 2025 (68.0% → 57.8%).
- Median AQI
- Median AQI: 46
The verdict
According to EPA Air Quality System monitoring data, Clarke County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 46 with 57.8% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 46
- median AQI · Good
- 57.8%
- days rated Good
- PM2.5
- main pollutant
- 12%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 89.
Annual release change
What changed in the 2025 EPA annual release
- Clarke County's peak single-day AQI fell from 126 to 89 between the 2024 and 2025 EPA annual releases, a change of -37 points.
- Clarke County's Good-day share fell from 61.0% to 57.8% between the 2024 and 2025 EPA annual releases, a change of -3.2 percentage points.
Data updated August 2026
- Good · 211 d · 57.8%
- Moderate · 154 d · 42.2%
How did Clarke County's air break down in 2025?
Across 365 monitored days, 211 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 89 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 46 (Good).
Insights: Clarke County, Georgia. EPA monitors recorded a median Air Quality Index of 46 across 365 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 211 (58%) fell in the Good band (AQI 0–50), 154 (42%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 63, while the worst single-day peak hit 89 (Moderate). Residents averaged about 17.3 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (267 days), Ozone (98 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -10.2 points and the median AQI moved +2 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 89, moderate but never Unhealthy. Nearby counties show comparable readings: Bibb (42.7% good, AQI 52); Charlton (92.6% good, AQI 27); Chatham (58.6% good, AQI 47); Chattooga (96.3% good, AQI 39); Clayton (54.1% good, AQI 48); Cobb (93.5% good, AQI 35).
Air Quality Summary
Good Days
57.8%
211 of 365 monitored days
-17.2pp vs 75% target
Max AQI Recorded
89
Moderate
Health Grade
Moderate
90th-pct AQI 63
Clarke County, Good days share 57.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Clarke 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 365 monitored days across EPA AQI categories.
Good
211
58%
Moderate
154
42%
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 Clarke County.
- PM2.5 · 267 days · 73.2%
- Ozone · 98 days · 26.8%
Health Impact Assessment
Moderate
Clarke County's air quality is rated Moderate based on 57.8% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 57.8% of monitored days in 2025, with a median AQI of 46. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 267 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Clarke County. Highest Good-day share: 2020 (68.0%, 249 of 366 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 249 | 117 | 0 | 0 | 44 | 99 |
| 2021 | 195 | 169 | 1 | 0 | 49 | 107 |
| 2022 | 201 | 161 | 0 | 0 | 47 | 88 |
| 2023 | 173 | 189 | 3 | 0 | 52 | 147 |
| 2024 | 222 | 140 | 2 | 0 | 46 | 126 |
| 2025 | 211 | 154 | 0 | 0 | 46 | 89 |
How does Clarke County compare?
How Clarke County compares
Good-day share worse than typical
Clarke County 57.8%
Beaver County, Pennsylvania 55.6%
Typical US county 76.0%
Median AQI worse than typical
Clarke County 46
Beaver County, Pennsylvania 46
Typical US county 39
Unhealthy days / yr better than typical
Clarke County 0
Beaver County, Pennsylvania 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Clarke County (46), not geographic neighbors.
Beaver County, Pennsylvania
Median AQI 46 · 55.6% Good-day share
Brookings County, South Dakota
Median AQI 46 · 58.6% Good-day share
Buchanan County, Missouri
Median AQI 46 · 56.4% Good-day share
Butte County, California
Median AQI 46 · 65.2% Good-day share
Clark County, Indiana
Median AQI 46 · 58.1% Good-day share
Coconino County, Arizona
Median AQI 46 · 70.1% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Hennepin County, Minnesota
57.8% Good-day share · median AQI 45
Hall County, Georgia
57.7% Good-day share · median AQI 46
Richland County, South Carolina
58.1% Good-day share · median AQI 47
Sedgwick County, Kansas
57.5% Good-day share · median AQI 48
Gwinnett County, Georgia
58.3% Good-day share · median AQI 47
DeKalb County, Georgia
58.4% Good-day share · median AQI 47
Georgia counties on the map
Geographic containment only, other monitored counties in Georgia, independent of AQI or pollutant match.
What Clarke County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 46 means for exposure. Health guidance
- See how Clarke County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Clarke County with its Georgia neighbours before drawing a conclusion about the region. All of Georgia
Based on 365 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Clarke County, Georgia? ▼
Clarke County has a median Air Quality Index (AQI) of 46, rated "Good." 57.8% of monitored days (211 out of 365) had good air quality in 2025.
What is the main pollutant in Clarke County? ▼
The primary pollutant in Clarke County is Fine Particles (PM2.5), which was the main AQI driver on 267 days (73% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Clarke County have? ▼
In 2025, Clarke County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 89.
Is the air quality in Clarke County getting better or worse? ▼
Air quality in Clarke County is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 68.0% (249 of 366 days). Lowest qualifying Good-day share: 2023 at 47.4% (173 of 365 days).
What does AQI 46 mean for health? ▼
Clarke County's median AQI of 46 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Clarke County compare to other counties in Georgia? ▼
Clarke County has 57.8% good air days. Nearby counties in Georgia: Bibb (42.7% good), Charlton (92.6% good), Chatham (58.6% good), Chattooga (96.3% good), Clayton (54.1% good), Cobb (93.5% good).
What is the 90th percentile AQI in Clarke County? ▼
The 90th percentile AQI for Clarke County is 63, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 89 (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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Clarke County, Georgia · 2020–2025
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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.