Miami Air Quality in December
Across 2019–2025, Miami's December air quality had a median AQI of 49 (Good) over 217 monitored days in the Miami-Fort Lauderdale-West Palm Beach, FL area. 1.0% of December days (2 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 77.0% of days. The cleanest December on record here was 2024 (median AQI 42, 0 days above 100) and the worst was 2021 (median 49, 1 day above 100, peak AQI 135).
- Good: 55.3%
- Moderate: 43.8%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.5%
Extra Protection for Miami Homes
Air quality in Miami is moderate (AQI 54), 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 December?
Good on a typical day: median AQI 49 across 2019–2025, with 1.0% of December days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓55.3% of December days were Good (AQI 0–50), 43.8% Moderate (51–100).
- ✓2 days of 217 reached AQI 101+; the December peak was 156.
- ✓Best December: 2024; worst December: 2021.
Frequently asked questions
What is the air quality like in Miami in December?▾
Across 2019–2025, the median daily AQI in Miami in December was 49 (Good). 55.3% of days were Good, 43.8% Moderate, and 1.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is December a good time for outdoor exercise in Miami?▾
A typical December day in Miami sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of December days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Miami's December air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 77.0% of December days in Miami. The highest December AQI recorded in 2019–2025 was 156 (Unhealthy), in 2021.
Miami December air quality, year by year
Miami December 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 | 71 | PM2.5 |
| 2020 | 31 | 52 | 0 | 68 | PM2.5 |
| 2021worst | 31 | 49 | 1 | 135 | PM2.5 |
| 2022 | 31 | 54 | 0 | 91 | PM2.5 |
| 2023 | 31 | 42 | 1 | 156 | PM2.5 |
| 2024cleanest | 31 | 42 | 0 | 64 | PM2.5 |
| 2025 | 31 | 48 | 0 | 80 | PM2.5 |
What December air means in Miami
A typical December day in Miami sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of December days (1.0%) reached AQI 101+ in 2019–2025.
December's median AQI of 49 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 December AQI across every EPA metro area (95,590 metro-days, 2019–2025) is 39, so Miami runs above the national December norm; 1.0% of its December days topped AQI 100 versus 0.7% nationally (about the same).
December 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 54 (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.