Jacksonville Air Quality in September
Across 2019–2025, Jacksonville's September air quality had a median AQI of 47 (Good) over 210 monitored days in the Jacksonville, FL area. 0.0% of September days (0 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 83.3% of days. The cleanest September on record here was 2022 (median AQI 43, 0 days above 100) and the worst was 2021 (median 52, 0 days above 100, peak AQI 61).
- Good: 58.6%
- Moderate: 41.4%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
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How is the air in Jacksonville in September?
Good on a typical day: median AQI 47 across 2019–2025, with 0.0% of September days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓58.6% of September days were Good (AQI 0–50), 41.4% Moderate (51–100).
- ✓0 days of 210 reached AQI 101+; the September peak was 95.
- ✓Best September: 2022; worst September: 2021.
Frequently asked questions
What is the air quality like in Jacksonville in September?▾
Across 2019–2025, the median daily AQI in Jacksonville in September was 47 (Good). 58.6% of days were Good, 41.4% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Jacksonville?▾
A typical September day in Jacksonville sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
Which pollutant causes Jacksonville's September air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 83.3% of September days in Jacksonville. The highest September AQI recorded in 2019–2025 was 95 (Moderate), in 2021.
Jacksonville September air quality, year by year
Jacksonville September air quality by year (Jacksonville, FL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 50 | 0 | 93 | PM2.5 |
| 2020 | 30 | 44 | 0 | 95 | PM2.5 |
| 2021worst | 30 | 52 | 0 | 61 | PM2.5 |
| 2022cleanest | 30 | 43 | 0 | 67 | PM2.5 |
| 2023 | 30 | 49 | 0 | 62 | PM2.5 |
| 2024 | 30 | 46 | 0 | 77 | PM2.5 |
| 2025 | 30 | 46 | 0 | 58 | PM2.5 |
What September air means in Jacksonville
A typical September day in Jacksonville sits in the Good range (median AQI 47), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of September days reached AQI 101+ in 2019–2025.
September's median AQI of 47 is below Jacksonville's whole-year median of 52, making it one of the area's cleaner periods. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Jacksonville runs above the national September norm; 0.0% of its September days topped AQI 100 versus 2.7% nationally (below average).
September is part of Jacksonville's fall season (September, October, November); the fall page pools all three months.
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 month 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.