Miami Air Quality in January
Across 2019–2025, Miami's January air quality had a median AQI of 52 (Moderate) over 217 monitored days in the Miami-Fort Lauderdale-West Palm Beach, FL area. 1.8% of January days (4 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 85.3% of days. The cleanest January on record here was 2025 (median AQI 49, 0 days above 100) and the worst was 2023 (median 58, 1 day above 100, peak AQI 170).
- Good: 36.4%
- Moderate: 61.8%
- Unhealthy for Sensitive Groups: 0.9%
- Unhealthy or worse: 0.9%
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.
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How is the air in Miami in January?
Moderate on a typical day: median AQI 52 across 2019–2025, with 1.8% of January days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓36.4% of January days were Good (AQI 0–50), 61.8% Moderate (51–100).
- ✓4 days of 217 reached AQI 101+; the January peak was 197.
- ✓Best January: 2025; worst January: 2023.
Frequently asked questions
What is the air quality like in Miami in January?▾
Across 2019–2025, the median daily AQI in Miami in January was 52 (Moderate). 36.4% of days were Good, 61.8% Moderate, and 1.8% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is January a good time for outdoor exercise in Miami?▾
A typical January 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 56 of January days (1.8%) 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 January air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 85.3% of January days in Miami. The highest January AQI recorded in 2019–2025 was 197 (Unhealthy), in 2023.
Miami January air quality, year by year
Miami January 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 | 49 | 1 | 146 | PM2.5 |
| 2020 | 31 | 54 | 0 | 84 | PM2.5 |
| 2021 | 31 | 56 | 0 | 69 | PM2.5 |
| 2022 | 31 | 51 | 1 | 136 | PM2.5 |
| 2023worst | 31 | 58 | 1 | 170 | PM2.5 |
| 2024 | 31 | 52 | 1 | 197 | PM2.5 |
| 2025cleanest | 31 | 49 | 0 | 80 | PM2.5 |
What January air means in Miami
A typical January 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 56 of January days (1.8%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
January'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 January AQI across every EPA metro area (95,602 metro-days, 2019–2025) is 39, so Miami runs above the national January norm; 1.8% of its January days topped AQI 100 versus 0.7% nationally (above average).
January is part of Miami's winter season (December, January, February); the winter 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.