Median AQI
44
Good
Georgia · County air quality · 2025
Clarke County, Georgia
Median AQI 44 (Good). 66.7% of monitored days rated Good, direct from EPA Air Quality System stations.
- 44
- Median AQI
- 66.7%
- Good-air days
- 0
- Unhealthy days
- 25%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Clarke County's air is good on balance, more polluted than the median US county, a median AQI of 44 with 66.7% of 273 monitored days in the Good band, driven mainly by PM2.5.
- 44
- median AQI · Good
- 66.7%
- days rated Good
- PM2.5
- main pollutant
- 25%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 89.
Data updated July 2026
- Good · 182 d · 66.7%
- Moderate · 91 d · 33.3%
How did Clarke County's air break down in 2025?
Across 273 monitored days, 182 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). 273 days monitored. Median AQI: 44 (Good).
Insights: Clarke County, Georgia. EPA monitors recorded a median Air Quality Index of 44 across 273 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 182 (67%) fell in the Good band (AQI 0–50), 91 (33%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 60, while the worst single-day peak hit 89 (Moderate). Residents averaged about 20.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (167 days), Ozone (106 days). Across the 2020–2025 trend window, good days shifted by -67 and the median AQI moved +0 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 89, moderate but never Unhealthy. Nearby counties show comparable readings: Bibb (49.5% good, AQI 51); Charlton (79.0% good, AQI 24); Chatham (66.7% good, AQI 44); Clayton (53.1% good, AQI 49); Cobb (92.5% good, AQI 36); Coffee (69.1% good, AQI 44).
Air Quality Summary
Good Days
66.7%
182 of 273 monitored days
-8.3pp vs 75% target
Max AQI Recorded
89
Moderate
Health Grade
Moderate
90th-pct AQI 60
Clarke County, Good days share 66.7%
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 273 monitored days across EPA AQI categories.
Good
182
67%
Moderate
91
33%
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 · 167 days · 61.2%
- Ozone · 106 days · 38.8%
Health Impact Assessment
Moderate
Clarke County's air quality is rated Moderate based on 66.7% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 66.7% of monitored days in 2025, with a median AQI of 44. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 167 of 273 monitored days.
5-Year Air Quality Trend
Air quality is stable in Clarke County. Best year: 2020 (249 good 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 | 182 | 91 | 0 | 0 | 44 | 89 |
How does Clarke County compare?
How Clarke County compares
Good-day share worse than US avg
Clarke County 66.7%
Bibb County, Georgia 49.5%
US average 76.5%
Median AQI worse than US avg
Clarke County 44
Bibb County, Georgia 51
US average 38
Unhealthy days / yr about average
Clarke County 0
Bibb County, Georgia 0
US average 0
Other Counties in Georgia
Air quality comparison for nearby counties in Georgia.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Clarke County.
Baltimore County, Maryland
AQI 44 · 70.4% good
Baltimore (City) County, Maryland
AQI 44 · 68.7% good
Bartholomew County, Indiana
AQI 44 · 69.2% good
Berks County, Pennsylvania
AQI 44 · 65.6% good
Bolivar County, Mississippi
AQI 44 · 70.3% good
Brewster County, Texas
AQI 44 · 69.0% good
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 44 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 273 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 Clarke County, Georgia? ▼
Clarke County has a median Air Quality Index (AQI) of 44, rated "Good." 66.7% of monitored days (182 out of 273) 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 167 days (61% 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 stable based on 5-year trends (2020-2025). Best year: 2020 with 249 good days. Worst year: 2023 with 173 good days.
What does AQI 44 mean for health? ▼
Clarke County's median AQI of 44 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 Clarke County compare to other counties in Georgia? ▼
Clarke County has 66.7% good air days. Nearby counties in Georgia: Bibb (49.5% good), Charlton (79.0% good), Chatham (66.7% good), Clayton (53.1% good), Cobb (92.5% good), Coffee (69.1% good).
What is the 90th percentile AQI in Clarke County? ▼
The 90th percentile AQI for Clarke County is 60, 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.
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.