Median AQI
48
Good
Georgia · County air quality · 2025
Walker County, Georgia
Median AQI 48 (Good). 53.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 48
- Median AQI
- 53.4%
- Good-air days
- 2
- Unhealthy days
- 8%
- Cleaner than US counties
Walker County's 2025 annual median AQI is 48 (Good), with 53.4% Good days
According to the U.S. EPA Air Quality System, Walker County, Georgia posted a 2025 median AQI of 48 (Good) across 365 monitored days, with 53.4% 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
- Walker County's 53.4% Good-day share places it cleaner than 8% of US counties in 2025.
- Closest median-AQI peer
- Adair County (55.8% Good, median AQI 48) is the closest nationwide median-AQI peer to Walker County.
- 2020–2025 trend
- Walker County's floor-qualifying Good-day share is worsening from 2020 to 2025 (66.7% → 53.4%).
- Median AQI
- Median AQI: 48
The verdict
According to EPA Air Quality System monitoring data, Walker County's air is good on balance, among the most polluted counties nationally, a median AQI of 48 with 53.4% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 48
- median AQI · Good
- 53.4%
- days rated Good
- PM2.5
- main pollutant
- 8%
- cleaner than US counties
2 days reached Unhealthy or worse; the worst single reading hit AQI 181.
Annual release change
What changed in the 2025 EPA annual release
- Walker County's peak single-day AQI rose from 98 to 181 between the 2024 and 2025 EPA annual releases, a change of +83 points.
- Walker County's Good-day share rose from 45.5% to 53.4% between the 2024 and 2025 EPA annual releases, a change of +8.0 percentage points.
- Walker County's Unhealthy-category days rose from 0 to 2 between the 2024 and 2025 EPA annual releases, a change of +2 days.
- Walker County's median AQI fell from 52 to 48 between the 2024 and 2025 EPA annual releases, a change of -4 points.
Data updated August 2026
- Good · 195 d · 53.4%
- Moderate · 166 d · 45.5%
- USG · 2 d · 0.5%
- Unhealthy · 2 d · 0.5%
How did Walker County's air break down in 2025?
Across 365 monitored days, 195 fell in the Good band (AQI 0–50) and 2 reached Unhealthy or worse. The worst single day peaked at AQI 181 (Unhealthy).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 48 (Good).
Insights: Walker County, Georgia. EPA monitors recorded a median Air Quality Index of 48 across 365 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 195 (53%) fell in the Good band (AQI 0–50), 166 (45%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 64, while the worst single-day peak hit 181 (Unhealthy). Residents averaged about 16.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (365 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -13.2 points (measured against 177 monitored days in 2020 and 365 in 2025, so raw day counts are not comparable) and the median AQI moved +7 points, placing the multi-year trajectory at worsening. The annual record contains 2 days at Unhealthy or worse. On those days, the EPA recommends that sensitive groups limit prolonged outdoor exertion. 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
53.4%
195 of 365 monitored days
-21.6pp vs 75% target
Max AQI Recorded
181
Unhealthy
Health Grade
Moderate
90th-pct AQI 64
Walker County, Good days share 53.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Walker County, Unhealthy-or-worse share 5.5%
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
195
53%
Moderate
166
45%
USG
2
1%
Unhealthy
2
1%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Walker County.
- PM2.5 · 365 days · 100.0%
Health Impact Assessment
Moderate
Walker County's air quality is rated Moderate based on 53.4% good air days. There were 2 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 2 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 181. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is PM2.5, driving AQI on 365 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Walker County. Highest Good-day share: 2020 (66.7%, 118 of 177 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 118 | 59 | 0 | 0 | 41 | 86 |
| 2021 | 93 | 139 | 1 | 0 | 53 | 110 |
| 2022 | 136 | 216 | 0 | 0 | 53 | 89 |
| 2023 | 129 | 229 | 4 | 0 | 53 | 145 |
| 2024 | 165 | 198 | 0 | 0 | 52 | 98 |
| 2025 | 195 | 166 | 2 | 2 | 48 | 181 |
How does Walker County compare?
How Walker County compares
Good-day share worse than typical
Walker County 53.4%
Adair County, Oklahoma 55.8%
Typical US county 76.0%
Median AQI worse than typical
Walker County 48
Adair County, Oklahoma 48
Typical US county 39
Unhealthy days / yr worse than typical
Walker County 2
Adair County, Oklahoma 2
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Walker County (48), not geographic neighbors.
Adair County, Oklahoma
Median AQI 48 · 55.8% Good-day share
Arapahoe County, Colorado
Median AQI 48 · 58.1% Good-day share
Arkansas County, Arkansas
Median AQI 48 · 52.9% Good-day share
Ashley County, Arkansas
Median AQI 48 · 55.7% Good-day share
Boulder County, Colorado
Median AQI 48 · 58.4% Good-day share
Bowie County, Texas
Median AQI 48 · 55.0% 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).
Black Hawk County, Iowa
53.4% Good-day share · median AQI 49
Jefferson County, Ohio
53.4% Good-day share · median AQI 49
Hillsborough County, Florida
53.1% Good-day share · median AQI 49
Stark County, Ohio
53.1% Good-day share · median AQI 49
Ottawa County, Oklahoma
53.7% Good-day share · median AQI 49
Davidson County, Tennessee
52.9% Good-day share · median AQI 49
Georgia counties on the map
Geographic containment only, other monitored counties in Georgia, independent of AQI or pollutant match.
What Walker County's air means for you
On most days the air here is fine, but PM2.5 drives 2 unhealthy-or-worse days a year that sensitive groups should plan around.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 48 means for exposure. Health guidance
- See how Walker County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Walker 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 Walker County, Georgia? ▼
Walker County has a median Air Quality Index (AQI) of 48, rated "Good." 53.4% of monitored days (195 out of 365) had good air quality in 2025.
What is the main pollutant in Walker County? ▼
The primary pollutant in Walker County is Fine Particles (PM2.5), which was the main AQI driver on 365 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Walker County have? ▼
In 2025, Walker County recorded 2 unhealthy air days (2 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 181.
Is the air quality in Walker County getting better or worse? ▼
Air quality in Walker 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 66.7% (118 of 177 days). Lowest qualifying Good-day share: 2023 at 35.6% (129 of 362 days).
What does AQI 48 mean for health? ▼
Walker County's median AQI of 48 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Walker County compare to other counties in Georgia? ▼
Walker County has 53.4% 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 Walker County? ▼
The 90th percentile AQI for Walker County is 64, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 181 (Unhealthy).
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 Walker 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.