Median AQI
41
Good
Georgia · County air quality · 2025
Henry County, Georgia
Median AQI 41 (Good). 74.7% of monitored days rated Good, direct from EPA Air Quality System stations.
- 41
- Median AQI
- 74.7%
- Good-air days
- 0
- Unhealthy days
- 40%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Henry County's air is good on balance, more polluted than the median US county, a median AQI of 41 with 74.7% of 269 monitored days in the Good band, driven mainly by PM2.5.
- 41
- median AQI · Good
- 74.7%
- days rated Good
- PM2.5
- main pollutant
- 40%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 74.
Data updated July 2026
- Good · 201 d · 74.7%
- Moderate · 68 d · 25.3%
How did Henry County's air break down in 2025?
Across 269 monitored days, 201 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 74 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 269 days monitored. Median AQI: 41 (Good).
Insights: Henry County, Georgia. EPA monitors recorded a median Air Quality Index of 41 across 269 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 201 (75%) fell in the Good band (AQI 0–50), 68 (25%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 58, while the worst single-day peak hit 74 (Moderate). Residents averaged about 22.4 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (142 days), Ozone (127 days). Across the 2020–2025 trend window, good days shifted by -90 and the median AQI moved +5 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 74, 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); Clarke (66.7% good, AQI 44); Clayton (53.1% good, AQI 49); Cobb (92.5% good, AQI 36).
Air Quality Summary
Good Days
74.7%
201 of 269 monitored days
-0.3pp vs 75% target
Max AQI Recorded
74
Moderate
Health Grade
Moderate
90th-pct AQI 58
Henry County, Good days share 74.7%
National avg
Share of monitored days at AQI 0-50 (Good band).
Henry 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 269 monitored days across EPA AQI categories.
Good
201
75%
Moderate
68
25%
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 Henry County.
- PM2.5 · 142 days · 52.8%
- Ozone · 127 days · 47.2%
Health Impact Assessment
Moderate
Henry County's air quality is rated Moderate based on 74.7% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 74.7% of monitored days in 2025, with a median AQI of 41. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 142 of 269 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Henry County. Best year: 2020 (291 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 291 | 75 | 0 | 0 | 36 | 96 |
| 2021 | 259 | 100 | 1 | 0 | 39 | 112 |
| 2022 | 262 | 86 | 3 | 0 | 40 | 105 |
| 2023 | 226 | 128 | 6 | 1 | 44 | 153 |
| 2024 | 269 | 89 | 6 | 0 | 40 | 133 |
| 2025 | 201 | 68 | 0 | 0 | 41 | 74 |
How does Henry County compare?
How Henry County compares
Good-day share worse than US avg
Henry County 74.7%
Bibb County, Georgia 49.5%
US average 76.5%
Median AQI worse than US avg
Henry County 41
Bibb County, Georgia 51
US average 38
Unhealthy days / yr about average
Henry 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 Henry County.
Albemarle County, Virginia
AQI 41 · 77.9% good
Anderson County, South Carolina
AQI 41 · 90.0% good
Berkshire County, Massachusetts
AQI 41 · 71.6% good
Berrien County, Michigan
AQI 41 · 80.9% good
Blair County, Pennsylvania
AQI 41 · 71.9% good
Bonner County, Idaho
AQI 41 · 71.3% good
What Henry 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 41 means for exposure. Health guidance
- See how Henry County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Henry County with its Georgia neighbours before drawing a conclusion about the region. All of Georgia
Based on 269 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 Henry County, Georgia? ▼
Henry County has a median Air Quality Index (AQI) of 41, rated "Good." 74.7% of monitored days (201 out of 269) had good air quality in 2025.
What is the main pollutant in Henry County? ▼
The primary pollutant in Henry County is Fine Particles (PM2.5), which was the main AQI driver on 142 days (53% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Henry County have? ▼
In 2025, Henry County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 74.
Is the air quality in Henry County getting better or worse? ▼
Air quality in Henry County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 291 good days. Worst year: 2025 with 201 good days.
What does AQI 41 mean for health? ▼
Henry County's median AQI of 41 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 Henry County compare to other counties in Georgia? ▼
Henry County has 74.7% good air days. Nearby counties in Georgia: Bibb (49.5% good), Charlton (79.0% good), Chatham (66.7% good), Clarke (66.7% good), Clayton (53.1% good), Cobb (92.5% good).
What is the 90th percentile AQI in Henry County? ▼
The 90th percentile AQI for Henry County is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 74 (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.