Jacksonville Air Quality in Winter
Across 2019–2025, Jacksonville's winter (December–February) air quality had a median AQI of 52 (Moderate) over 632 monitored days in the Jacksonville, FL area. 0.7% of winter days (4 of 632) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 90.5% of days. The cleanest winter on record here was 2024 (median AQI 50, 0 days above 100) and the worst was 2025 (median 52, 3 days above 100, peak AQI 155).
- Good: 41.3%
- Moderate: 58.1%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.2%
Improve Indoor Air Quality
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How is the air in Jacksonville in winter?
Moderate on a typical day: median AQI 52 across 2019–2025, with 0.7% of winter days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓41.3% of winter days were Good (AQI 0–50), 58.1% Moderate (51–100).
- ✓4 days of 632 reached AQI 101+; the winter peak was 155.
- ✓Cleanest month: February; worst month: December.
Frequently asked questions
What is the air quality like in Jacksonville in winter?▾
Across 2019–2025, the median daily AQI in Jacksonville in winter was 52 (Moderate). 41.3% of days were Good, 58.1% Moderate, and 0.7% 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 Jacksonville?▾
A typical winter day in Jacksonville is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of winter 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 Jacksonville's winter air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 90.5% of winter days in Jacksonville. The highest winter AQI recorded in 2019–2025 was 155 (Unhealthy), in 2025.
Jacksonville winter air quality, year by year
Jacksonville winter air quality by year (Jacksonville, FL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 90 | 52 | 0 | 73 | PM2.5 |
| 2020 | 91 | 53 | 1 | 103 | PM2.5 |
| 2021 | 90 | 52 | 0 | 90 | PM2.5 |
| 2022 | 90 | 53 | 0 | 77 | PM2.5 |
| 2023 | 90 | 52 | 0 | 82 | PM2.5 |
| 2024cleanest | 91 | 50 | 0 | 98 | PM2.5 |
| 2025worst | 90 | 52 | 3 | 155 | PM2.5 |
What winter air means in Jacksonville
A typical winter day in Jacksonville is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of winter days 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 Jacksonville's whole-year median of 52, 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 Jacksonville runs above the national Winter norm; 0.7% of its Winter days topped AQI 100 versus 0.6% nationally (about the same).
Within the season, February is the cleanest month (median AQI 53, 0.0% of days above 100) and December the worst (median 52, 1.4% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Jacksonville
The latest EPA AirNow observation puts Jacksonville's AQI at 34 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current Jacksonville air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Jacksonville, 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.