Birmingham Air Quality in May
Across 2019–2025, Birmingham's May air quality had a median AQI of 55 (Moderate) over 217 monitored days in the Birmingham-Hoover, AL area. 0.9% of May days (2 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 70.5% of days. The cleanest May on record here was 2025 (median AQI 45, 0 days above 100) and the worst was 2019 (median 61, 2 days above 100, peak AQI 112).
- Good: 28.6%
- Moderate: 70.5%
- Unhealthy for Sensitive Groups: 0.9%
- Unhealthy or worse: 0.0%
Extra Protection for Birmingham Homes
Air quality in Birmingham is moderate (AQI 53), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in Birmingham in May?
Moderate on a typical day: median AQI 55 across 2019–2025, with 0.9% of May days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓28.6% of May days were Good (AQI 0–50), 70.5% Moderate (51–100).
- ✓2 days of 217 reached AQI 101+; the May peak was 112.
- ✓Best May: 2025; worst May: 2019.
Frequently asked questions
What is the air quality like in Birmingham in May?▾
Across 2019–2025, the median daily AQI in Birmingham in May was 55 (Moderate). 28.6% of days were Good, 70.5% Moderate, and 0.9% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is May a good time for outdoor exercise in Birmingham?▾
A typical May day in Birmingham is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of May days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Birmingham's May air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 70.5% of May days in Birmingham. The highest May AQI recorded in 2019–2025 was 112 (Unhealthy for Sensitive Groups), in 2019.
Birmingham May air quality, year by year
Birmingham May air quality by year (Birmingham-Hoover, AL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 31 | 61 | 2 | 112 | PM2.5 |
| 2020 | 31 | 54 | 0 | 74 | PM2.5 |
| 2021 | 31 | 58 | 0 | 87 | PM2.5 |
| 2022 | 31 | 56 | 0 | 84 | PM2.5 |
| 2023 | 31 | 61 | 0 | 93 | PM2.5 |
| 2024 | 31 | 57 | 0 | 71 | PM2.5 |
| 2025cleanest | 31 | 45 | 0 | 62 | PM2.5 |
What May air means in Birmingham
A typical May day in Birmingham is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of May days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
May's median AQI of 55 is in line with Birmingham's whole-year median of 56, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median May AQI across every EPA metro area (104,064 metro-days, 2019–2025) is 44, so Birmingham runs above the national May norm; 0.9% of its May days topped AQI 100 versus 1.3% nationally (about the same).
May is part of Birmingham's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Birmingham
The latest EPA AirNow observation puts Birmingham's AQI at 53 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Birmingham air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Birmingham-Hoover, AL), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.