Median AQI
42
Good
Alabama · County air quality · 2025
Baldwin County, Alabama
Median AQI 42 (Good). 75.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 42
- Median AQI
- 75.5%
- Good-air days
- 0
- Unhealthy days
- 45%
- Cleaner than US counties
Baldwin County's 2025 annual median AQI is 42 (Good), with 75.5% Good days
According to the U.S. EPA Air Quality System, Baldwin County, Alabama posted a 2025 median AQI of 42 (Good) across 355 monitored days, with 75.5% 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
- Baldwin County's 75.5% Good-day share places it cleaner than 45% of US counties in 2025.
- Closest median-AQI peer
- Ada County (74.0% Good, median AQI 42) is the closest nationwide median-AQI peer to Baldwin County.
- 2020–2025 trend
- Baldwin County's floor-qualifying Good-day share is worsening from 2020 to 2025 (82.9% → 75.5%).
- Median AQI
- Median AQI: 42
The verdict
According to EPA Air Quality System monitoring data, Baldwin County's air is good on balance, more polluted than the median US county, a median AQI of 42 with 75.5% of 355 monitored days in the Good band, driven mainly by PM2.5.
- 42
- median AQI · Good
- 75.5%
- days rated Good
- PM2.5
- main pollutant
- 45%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 87.
Annual release change
What changed in the 2025 EPA annual release
- Baldwin County's Good-day share fell from 78.3% to 75.5% between the 2024 and 2025 EPA annual releases, a change of -2.8 percentage points.
Data updated August 2026
- Good · 268 d · 75.5%
- Moderate · 87 d · 24.5%
How did Baldwin County's air break down in 2025?
Across 355 monitored days, 268 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 87 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 355 days monitored. Median AQI: 42 (Good).
Insights: Baldwin County, Alabama. EPA monitors recorded a median Air Quality Index of 42 across 355 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 268 (75%) fell in the Good band (AQI 0–50), 87 (25%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 55, while the worst single-day peak hit 87 (Moderate). Residents averaged about 22.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (219 days), Ozone (136 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -7.4 points (measured against 269 monitored days in 2020 and 355 in 2025, so raw day counts are not comparable) and the median AQI moved +4 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 87, moderate but never Unhealthy. Nearby counties show comparable readings: Clay (81.1% good, AQI 33); DeKalb (77.3% good, AQI 41); Elmore (97.9% good, AQI 34); Etowah (61.4% good, AQI 45); Jefferson (43.6% good, AQI 52); Lawrence (91.8% good, AQI 30).
Air Quality Summary
Good Days
75.5%
268 of 355 monitored days
0.5pp vs 75% target
Max AQI Recorded
87
Moderate
Health Grade
Good
90th-pct AQI 55
Baldwin County, Good days share 75.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Baldwin 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 355 monitored days across EPA AQI categories.
Good
268
75%
Moderate
87
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 Baldwin County.
- PM2.5 · 219 days · 61.7%
- Ozone · 136 days · 38.3%
Health Impact Assessment
Good
Baldwin County's air quality is rated Good based on 75.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 75.5% of monitored days in 2025, with a median AQI of 42. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 219 of 355 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Baldwin County. Highest Good-day share: 2021 (88.6%, 248 of 280 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 223 | 46 | 0 | 0 | 38 | 74 |
| 2021 | 248 | 32 | 0 | 0 | 37 | 63 |
| 2022 | 237 | 44 | 0 | 0 | 39 | 97 |
| 2023 | 236 | 111 | 0 | 0 | 43 | 90 |
| 2024 | 278 | 77 | 0 | 0 | 40 | 90 |
| 2025 | 268 | 87 | 0 | 0 | 42 | 87 |
How does Baldwin County compare?
How Baldwin County compares
Good-day share worse than typical
Baldwin County 75.5%
Ada County, Idaho 74.0%
Typical US county 76.0%
Median AQI worse than typical
Baldwin County 42
Ada County, Idaho 42
Typical US county 39
Unhealthy days / yr better than typical
Baldwin County 0
Ada County, Idaho 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Baldwin County (42), not geographic neighbors.
Ada County, Idaho
Median AQI 42 · 74.0% Good-day share
Adams County, Pennsylvania
Median AQI 42 · 74.4% Good-day share
Allen County, Ohio
Median AQI 42 · 67.0% Good-day share
Asotin County, Washington
Median AQI 42 · 61.9% Good-day share
Bell County, Kentucky
Median AQI 42 · 67.0% Good-day share
Belmont County, Ohio
Median AQI 42 · 63.0% 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).
Campbell County, Kentucky
75.6% Good-day share · median AQI 39
Henry County, Georgia
75.6% Good-day share · median AQI 39
Sauk County, Wisconsin
75.6% Good-day share · median AQI 35
Wakulla County, Florida
75.6% Good-day share · median AQI 41
Stearns County, Minnesota
75.6% Good-day share · median AQI 37
Gage County, Nebraska
75.8% Good-day share · median AQI 34
Alabama counties on the map
Geographic containment only, other monitored counties in Alabama, independent of AQI or pollutant match.
What Baldwin 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 42 means for exposure. Health guidance
- See how Baldwin County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Baldwin County with its Alabama neighbours before drawing a conclusion about the region. All of Alabama
Based on 355 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 Baldwin County, Alabama? ▼
Baldwin County has a median Air Quality Index (AQI) of 42, rated "Good." 75.5% of monitored days (268 out of 355) had good air quality in 2025.
What is the main pollutant in Baldwin County? ▼
The primary pollutant in Baldwin County is Fine Particles (PM2.5), which was the main AQI driver on 219 days (62% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Baldwin County have? ▼
In 2025, Baldwin County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 87.
Is the air quality in Baldwin County getting better or worse? ▼
Air quality in Baldwin 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: 2021 at 88.6% (248 of 280 days). Lowest qualifying Good-day share: 2023 at 68.0% (236 of 347 days).
What does AQI 42 mean for health? ▼
Baldwin County's median AQI of 42 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Baldwin County compare to other counties in Alabama? ▼
Baldwin County has 75.5% good air days. Nearby counties in Alabama: Clay (81.1% good), DeKalb (77.3% good), Elmore (97.9% good), Etowah (61.4% good), Jefferson (43.6% good), Lawrence (91.8% good).
What is the 90th percentile AQI in Baldwin County? ▼
The 90th percentile AQI for Baldwin County is 55, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 87 (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 Baldwin County, Alabama · 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.