Miami Air Quality in May
Across 2019–2025, Miami's May air quality had a median AQI of 53 (Moderate) over 217 monitored days in the Miami-Fort Lauderdale-West Palm Beach, FL area. 1.0% of May days (2 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 78.3% of days. The cleanest May on record here was 2025 (median AQI 48, 0 days above 100) and the worst was 2023 (median 57, 1 day above 100, peak AQI 154).
- Good: 36.9%
- Moderate: 62.2%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.5%
Extra Protection for Miami Homes
Air quality in Miami is moderate (AQI 51), 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 Miami in May?
Moderate on a typical day: median AQI 53 across 2019–2025, with 1.0% of May days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓36.9% of May days were Good (AQI 0–50), 62.2% Moderate (51–100).
- ✓2 days of 217 reached AQI 101+; the May peak was 154.
- ✓Best May: 2025; worst May: 2023.
Frequently asked questions
What is the air quality like in Miami in May?▾
Across 2019–2025, the median daily AQI in Miami in May was 53 (Moderate). 36.9% of days were Good, 62.2% Moderate, and 1.0% 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 Miami?▾
A typical May day in Miami is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 100 of May days (1.0%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Miami's May air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 78.3% of May days in Miami. The highest May AQI recorded in 2019–2025 was 154 (Unhealthy), in 2023.
Miami May air quality, year by year
Miami May air quality by year (Miami-Fort Lauderdale-West Palm Beach, FL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 51 | 0 | 67 | PM2.5 |
| 2020 | 31 | 57 | 0 | 93 | PM2.5 |
| 2021 | 31 | 53 | 1 | 103 | PM2.5 |
| 2022 | 31 | 51 | 0 | 93 | PM2.5 |
| 2023worst | 31 | 57 | 1 | 154 | PM2.5 |
| 2024 | 31 | 58 | 0 | 79 | PM2.5 |
| 2025cleanest | 31 | 48 | 0 | 67 | PM2.5 |
What May air means in Miami
A typical May day in Miami is Moderate (median AQI 53): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 100 of May days (1.0%) 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 53 is in line with Miami's whole-year median of 51, 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 Miami runs above the national May norm; 1.0% of its May days topped AQI 100 versus 1.3% nationally (about the same).
May is part of Miami's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Miami
The latest EPA AirNow observation puts Miami's AQI at 51 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Miami air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Miami-Fort Lauderdale-West Palm Beach, FL), 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.