Median AQI
38
Good
Georgia · County air quality · 2024
Sumter County, Georgia
Median AQI 38 (Good). 93.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 38
- Median AQI
- 93.4%
- Good-air days
- 0
- Unhealthy days
- 80%
- Cleaner than US counties
Sumter County's 2024 annual median AQI is 38 (Good), with 93.4% Good days
According to the U.S. EPA Air Quality System, Sumter County, Georgia posted a 2024 median AQI of 38 (Good) across 244 monitored days, with 93.4% 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
- Sumter County's 93.4% Good-day share places it cleaner than 80% of US counties in 2024.
- Closest median-AQI peer
- Big Horn County (89.2% Good, median AQI 39) is the closest nationwide median-AQI peer to Sumter County.
- 2020–2024 trend
- Sumter County's floor-qualifying Good-day share is worsening from 2020 to 2024 (98.8% → 93.4%).
- Median AQI
- Median AQI: 38
The verdict
According to EPA Air Quality System monitoring data, Sumter County's air is good on balance, cleaner than most US counties, a median AQI of 38 with 93.4% of 244 monitored days in the Good band, driven mainly by Ozone.
- 38
- median AQI · Good
- 93.4%
- days rated Good
- Ozone
- main pollutant
- 80%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 84.
Annual release change
What changed in the 2024 EPA annual release
- Sumter County's Good-day share rose from 91.8% to 93.4% between the 2023 and 2024 EPA annual releases, a change of +1.6 percentage points.
Data updated August 2026
- Good · 228 d · 93.4%
- Moderate · 16 d · 6.6%
How did Sumter County's air break down in 2024?
Across 244 monitored days, 228 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 84 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2024). 244 days monitored. Median AQI: 38 (Good).
Insights: Sumter County, Georgia. EPA monitors recorded a median Air Quality Index of 38 across 244 measured days in 2024, earning a Good classification and a Excellent health grade. Of those days, 228 (93%) fell in the Good band (AQI 0–50), 16 (7%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 49, while the worst single-day peak hit 84 (Moderate). Residents averaged about 28.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (244 days). Across the 2020–2024 trend window, the share of monitored days rated Good shifted by -5.3 points and the median AQI moved +6 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2024 window was AQI 84, 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); Clarke (57.8% good, AQI 46); Clayton (54.1% good, AQI 48).
Air Quality Summary
Good Days
93.4%
228 of 244 monitored days
18.4pp vs 75% target
Max AQI Recorded
84
Moderate
Health Grade
Excellent
90th-pct AQI 49
Sumter County, Good days share 93.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Sumter 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 (2024)
Distribution of 244 monitored days across EPA AQI categories.
Good
228
93%
Moderate
16
7%
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 Sumter County.
- Ozone · 244 days · 100.0%
Health Impact Assessment
Excellent
Sumter County's air quality is rated Excellent based on 93.4% good air days. No unhealthy air days were recorded in 2024.
Air quality was acceptable on 93.4% of monitored days in 2024, with a median AQI of 38. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 244 of 244 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Sumter County. Highest Good-day share: 2020 (98.8%, 237 of 240 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 237 | 3 | 0 | 0 | 32 | 64 |
| 2021 | 228 | 17 | 0 | 0 | 35 | 74 |
| 2022 | 224 | 14 | 0 | 0 | 35 | 93 |
| 2023 | 225 | 20 | 0 | 0 | 38 | 87 |
| 2024 | 228 | 16 | 0 | 0 | 38 | 84 |
How does Sumter County compare?
How Sumter County compares
Good-day share better than US avg
Sumter County 93.4%
Big Horn County, Wyoming 89.2%
US average 76.0%
Median AQI better than US avg
Sumter County 38
Big Horn County, Wyoming 39
US average 39
Unhealthy days / yr better than US avg
Sumter County 0
Big Horn County, Wyoming 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Sumter County (38), not geographic neighbors.
Big Horn County, Wyoming
Median AQI 39 · 89.2% Good-day share
Chattooga County, Georgia
Median AQI 39 · 96.3% Good-day share
Weston County, Wyoming
Median AQI 39 · 87.7% Good-day share
Columbia County, Georgia
Median AQI 36 · 94.2% Good-day share
Jefferson County, Oklahoma
Median AQI 42 · 81.0% Good-day share
Pontotoc County, Oklahoma
Median AQI 43 · 71.6% Good-day share
Same primary pollutant: Ozone
Ozone 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).
Georgia counties on the map
Geographic containment only, other monitored counties in Georgia, independent of AQI or pollutant match.
What Sumter 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 38 means for exposure. Health guidance
- See how Sumter County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Sumter County with its Georgia neighbours before drawing a conclusion about the region. All of Georgia
Based on 244 EPA-monitored days in 2024; 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 Sumter County, Georgia? ▼
Sumter County has a median Air Quality Index (AQI) of 38, rated "Good." 93.4% of monitored days (228 out of 244) had good air quality in 2024.
What is the main pollutant in Sumter County? ▼
The primary pollutant in Sumter County is Ozone (O3), which was the main AQI driver on 244 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Sumter County have? ▼
In 2024, Sumter County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 84.
Is the air quality in Sumter County getting better or worse? ▼
Air quality in Sumter County is worsening across floor-qualifying years (2020-2024); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 98.8% (237 of 240 days). Lowest qualifying Good-day share: 2023 at 91.8% (225 of 245 days).
What does AQI 38 mean for health? ▼
Sumter County's median AQI of 38 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Sumter County compare to other counties in Georgia? ▼
Sumter County has 93.4% good air days. Nearby counties in Georgia: Bibb (42.7% good), Charlton (92.6% good), Chatham (58.6% good), Chattooga (96.3% good), Clarke (57.8% good), Clayton (54.1% good).
What is the 90th percentile AQI in Sumter County? ▼
The 90th percentile AQI for Sumter County is 49, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 84 (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 Sumter 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.