Median AQI
44
Good
Alabama · County air quality · 2025
Montgomery County, Alabama
Median AQI 44 (Good). 65.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 44
- Median AQI
- 65.4%
- Good-air days
- 0
- Unhealthy days
- 23%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Montgomery County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 44 with 65.4% of 237 monitored days in the Good band, driven mainly by PM2.5.
- 44
- median AQI · Good
- 65.4%
- days rated Good
- PM2.5
- main pollutant
- 23%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 90.
Data updated July 2026
- Good · 155 d · 65.4%
- Moderate · 82 d · 34.6%
How did Montgomery County's air break down in 2025?
Across 237 monitored days, 155 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 90 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 237 days monitored. Median AQI: 44 (Good).
Insights: Montgomery County, Alabama. EPA monitors recorded a median Air Quality Index of 44 across 237 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 155 (65%) fell in the Good band (AQI 0–50), 82 (35%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 57, while the worst single-day peak hit 90 (Moderate). Residents averaged about 19.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (188 days), Ozone (49 days). Across the 2020–2025 trend window, good days shifted by +85 and the median AQI moved -14 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 90, moderate but never Unhealthy. Nearby counties show comparable readings: Baldwin (72.2% good, AQI 42); Clay (85.4% good, AQI 32); DeKalb (78.6% good, AQI 42); Elmore (97.2% good, AQI 32); Etowah (63.5% good, AQI 45); Jefferson (36.8% good, AQI 53).
Air Quality Summary
Good Days
65.4%
155 of 237 monitored days
-9.6pp vs 75% target
Max AQI Recorded
90
Moderate
Health Grade
Moderate
90th-pct AQI 57
Montgomery County, Good days share 65.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Montgomery 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 237 monitored days across EPA AQI categories.
Good
155
65%
Moderate
82
35%
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 Montgomery County.
- PM2.5 · 188 days · 79.3%
- Ozone · 49 days · 20.7%
Health Impact Assessment
Moderate
Montgomery County's air quality is rated Moderate based on 65.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 65.4% 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 188 of 237 monitored days.
5-Year Air Quality Trend
Air quality is improving in Montgomery County. Best year: 2022 (269 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 70 | 289 | 2 | 0 | 58 | 116 |
| 2021 | 222 | 132 | 0 | 0 | 44 | 93 |
| 2022 | 269 | 94 | 0 | 0 | 41 | 96 |
| 2023 | 138 | 193 | 0 | 0 | 52 | 93 |
| 2024 | 247 | 110 | 1 | 0 | 42 | 102 |
| 2025 | 155 | 82 | 0 | 0 | 44 | 90 |
How does Montgomery County compare?
How Montgomery County compares
Good-day share worse than US avg
Montgomery County 65.4%
Baldwin County, Alabama 72.2%
US average 76.5%
Median AQI worse than US avg
Montgomery County 44
Baldwin County, Alabama 42
US average 38
Unhealthy days / yr about average
Montgomery County 0
Baldwin County, Alabama 0
US average 0
Other Counties in Alabama
Air quality comparison for nearby counties in Alabama.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Montgomery 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 Montgomery 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 Montgomery County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Montgomery County with its Alabama neighbours before drawing a conclusion about the region. All of Alabama
Based on 237 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 Montgomery County, Alabama? ▼
Montgomery County has a median Air Quality Index (AQI) of 44, rated "Good." 65.4% of monitored days (155 out of 237) had good air quality in 2025.
What is the main pollutant in Montgomery County? ▼
The primary pollutant in Montgomery County is Fine Particles (PM2.5), which was the main AQI driver on 188 days (79% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Montgomery County have? ▼
In 2025, Montgomery County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 90.
Is the air quality in Montgomery County getting better or worse? ▼
Air quality in Montgomery County is improving based on 5-year trends (2020-2025). Best year: 2022 with 269 good days. Worst year: 2020 with 70 good days.
What does AQI 44 mean for health? ▼
Montgomery 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 Montgomery County compare to other counties in Alabama? ▼
Montgomery County has 65.4% good air days. Nearby counties in Alabama: Baldwin (72.2% good), Clay (85.4% good), DeKalb (78.6% good), Elmore (97.2% good), Etowah (63.5% good), Jefferson (36.8% good).
What is the 90th percentile AQI in Montgomery County? ▼
The 90th percentile AQI for Montgomery County is 57, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 90 (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.