Miami Air Quality in Winter
Across 2019–2025, Miami's winter (December–February) air quality had a median AQI of 52 (Moderate) over 632 monitored days in the Miami-Fort Lauderdale-West Palm Beach, FL area. 1.3% of winter days (8 of 632) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 81.3% of days. The cleanest winter on record here was 2025 (median AQI 47, 0 days above 100) and the worst was 2024 (median 49, 3 days above 100, peak AQI 197).
- Good: 43.8%
- Moderate: 54.9%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.8%
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
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Miami in winter?
Moderate on a typical day: median AQI 52 across 2019–2025, with 1.3% of winter days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓43.8% of winter days were Good (AQI 0–50), 54.9% Moderate (51–100).
- ✓8 days of 632 reached AQI 101+; the winter peak was 197.
- ✓Cleanest month: December; worst month: January.
Frequently asked questions
What is the air quality like in Miami in winter?▾
Across 2019–2025, the median daily AQI in Miami in winter was 52 (Moderate). 43.8% of days were Good, 54.9% Moderate, and 1.3% reached Unhealthy for Sensitive Groups or worse, based on 632 monitored days in EPA's Air Quality System.
Is winter a good time for outdoor exercise in Miami?▾
A typical winter day in Miami is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 77 of winter days (1.3%) 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 winter air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 81.3% of winter days in Miami. The highest winter AQI recorded in 2019–2025 was 197 (Unhealthy), in 2024.
Miami winter air quality, year by year
Miami winter 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 | 90 | 50 | 1 | 146 | PM2.5 |
| 2020 | 91 | 52 | 0 | 84 | PM2.5 |
| 2021 | 90 | 53 | 1 | 135 | PM2.5 |
| 2022 | 90 | 52 | 1 | 136 | PM2.5 |
| 2023 | 90 | 54 | 2 | 170 | PM2.5 |
| 2024worst | 91 | 49 | 3 | 197 | PM2.5 |
| 2025cleanest | 90 | 47 | 0 | 80 | PM2.5 |
What winter air means in Miami
A typical winter day in Miami is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 77 of winter days (1.3%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Winter's median AQI of 52 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 Winter AQI across every EPA metro area (278,620 metro-days, 2019–2025) is 40, so Miami runs above the national Winter norm; 1.3% of its Winter days topped AQI 100 versus 0.6% nationally (about the same).
Within the season, December is the cleanest month (median AQI 49, 1.0% of days above 100) and January the worst (median 52, 1.8% above 100).
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 season 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.