Jacksonville Air Quality in October
Across 2019–2025, Jacksonville's October air quality had a median AQI of 46 (Good) over 217 monitored days in the Jacksonville, FL area. 0.5% of October days (1 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 82.5% of days. The cleanest October on record here was 2019 (median AQI 39, 0 days above 100) and the worst was 2023 (median 42, 1 day above 100, peak AQI 124).
- Good: 59.9%
- Moderate: 39.6%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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How is the air in Jacksonville in October?
Good on a typical day: median AQI 46 across 2019–2025, with 0.5% of October days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓59.9% of October days were Good (AQI 0–50), 39.6% Moderate (51–100).
- ✓1 day of 217 reached AQI 101+; the October peak was 124.
- ✓Best October: 2019; worst October: 2023.
Frequently asked questions
What is the air quality like in Jacksonville in October?▾
Across 2019–2025, the median daily AQI in Jacksonville in October was 46 (Good). 59.9% of days were Good, 39.6% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is October a good time for outdoor exercise in Jacksonville?▾
A typical October day in Jacksonville sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of October days reached AQI 101+ in 2019–2025.
Which pollutant causes Jacksonville's October air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 82.5% of October days in Jacksonville. The highest October AQI recorded in 2019–2025 was 124 (Unhealthy for Sensitive Groups), in 2023.
Jacksonville October air quality, year by year
Jacksonville October air quality by year (Jacksonville, FL, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 31 | 39 | 0 | 55 | PM2.5 |
| 2020 | 31 | 47 | 0 | 66 | PM2.5 |
| 2021 | 31 | 46 | 0 | 62 | PM2.5 |
| 2022 | 31 | 57 | 0 | 93 | PM2.5 |
| 2023worst | 31 | 42 | 1 | 124 | PM2.5 |
| 2024 | 31 | 50 | 0 | 77 | PM2.5 |
| 2025 | 31 | 43 | 0 | 68 | PM2.5 |
What October air means in Jacksonville
A typical October day in Jacksonville sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of October days reached AQI 101+ in 2019–2025.
October's median AQI of 46 is below Jacksonville's whole-year median of 52, making it one of the area's cleaner periods. Nationally, the median October AQI across every EPA metro area (102,872 metro-days, 2019–2025) is 38, so Jacksonville runs above the national October norm; 0.5% of its October days topped AQI 100 versus 1.3% nationally (about the same).
October 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.