Jacksonville Air Quality in Fall
Across 2019–2025, Jacksonville's fall (September–November) air quality had a median AQI of 48 (Good) over 637 monitored days in the Jacksonville, FL area. 0.2% of fall days (1 of 637) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 85.2% of days. The cleanest fall on record here was 2019 (median AQI 47, 0 days above 100) and the worst was 2023 (median 48, 1 day above 100, peak AQI 124).
- Good: 53.8%
- Moderate: 46.0%
- Unhealthy for Sensitive Groups: 0.2%
- Unhealthy or worse: 0.0%
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How is the air in Jacksonville in fall?
Good on a typical day: median AQI 48 across 2019–2025, with 0.2% of fall days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓53.8% of fall days were Good (AQI 0–50), 46.0% Moderate (51–100).
- ✓1 day of 637 reached AQI 101+; the fall peak was 124.
- ✓Cleanest month: September; worst month: October.
Frequently asked questions
What is the air quality like in Jacksonville in fall?▾
Across 2019–2025, the median daily AQI in Jacksonville in fall was 48 (Good). 53.8% of days were Good, 46.0% Moderate, and 0.2% reached Unhealthy for Sensitive Groups or worse, based on 637 monitored days in EPA's Air Quality System.
Is fall a good time for outdoor exercise in Jacksonville?▾
A typical fall day in Jacksonville sits in the Good range (median AQI 48), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Which pollutant causes Jacksonville's fall air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 85.2% of fall days in Jacksonville. The highest fall AQI recorded in 2019–2025 was 124 (Unhealthy for Sensitive Groups), in 2023.
Jacksonville fall air quality, year by year
Jacksonville fall air quality by year (Jacksonville, FL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 91 | 47 | 0 | 93 | PM2.5 |
| 2020 | 91 | 47 | 0 | 95 | PM2.5 |
| 2021 | 91 | 52 | 0 | 70 | PM2.5 |
| 2022 | 91 | 54 | 0 | 93 | PM2.5 |
| 2023worst | 91 | 48 | 1 | 124 | PM2.5 |
| 2024 | 91 | 48 | 0 | 77 | PM2.5 |
| 2025 | 91 | 47 | 0 | 72 | PM2.5 |
What fall air means in Jacksonville
A typical fall day in Jacksonville sits in the Good range (median AQI 48), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of fall days reached AQI 101+ in 2019–2025.
Fall's median AQI of 48 is below Jacksonville's whole-year median of 52, making it one of the area's cleaner periods. Nationally, the median Fall AQI across every EPA metro area (296,275 metro-days, 2019–2025) is 40, so Jacksonville runs above the national Fall norm; 0.2% of its Fall days topped AQI 100 versus 1.5% nationally (below average).
Within the season, September is the cleanest month (median AQI 47, 0.0% of days above 100) and October the worst (median 46, 0.5% 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.