Baton Rouge Air Quality in September
Across 2019–2025, Baton Rouge's September air quality had a median AQI of 56 (Moderate) over 210 monitored days in the Baton Rouge, LA area. 2.9% of September days (6 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 65.7% of days. The cleanest September on record here was 2021 (median AQI 56, 0 days above 100) and the worst was 2023 (median 60, 3 days above 100, peak AQI 140).
- Good: 29.0%
- Moderate: 68.1%
- Unhealthy for Sensitive Groups: 2.9%
- Unhealthy or worse: 0.0%
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How is the air in Baton Rouge in September?
Moderate on a typical day: median AQI 56 across 2019–2025, with 2.9% of September days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓29.0% of September days were Good (AQI 0–50), 68.1% Moderate (51–100).
- ✓6 days of 210 reached AQI 101+; the September peak was 140.
- ✓Best September: 2021; worst September: 2023.
Frequently asked questions
What is the air quality like in Baton Rouge in September?▾
Across 2019–2025, the median daily AQI in Baton Rouge in September was 56 (Moderate). 29.0% of days were Good, 68.1% Moderate, and 2.9% 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 Baton Rouge?▾
A typical September day in Baton Rouge is Moderate (median AQI 56): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 34 of September days (2.9%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Baton Rouge's September air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 65.7% of September days in Baton Rouge. The highest September AQI recorded in 2019–2025 was 140 (Unhealthy for Sensitive Groups), in 2023.
Baton Rouge September air quality, year by year
Baton Rouge September air quality by year (Baton Rouge, LA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 59 | 0 | 100 | PM2.5 |
| 2020 | 30 | 52 | 1 | 101 | PM2.5 |
| 2021cleanest | 30 | 56 | 0 | 90 | PM2.5 |
| 2022 | 30 | 56 | 1 | 129 | PM2.5 |
| 2023worst | 30 | 60 | 3 | 140 | O3 |
| 2024 | 30 | 56 | 0 | 100 | PM2.5 |
| 2025 | 30 | 58 | 1 | 108 | PM2.5 |
What September air means in Baton Rouge
A typical September day in Baton Rouge is Moderate (median AQI 56): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 34 of September days (2.9%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
September's median AQI of 56 is in line with Baton Rouge's whole-year median of 53, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Baton Rouge runs above the national September norm; 2.9% of its September days topped AQI 100 versus 2.7% nationally (about the same).
September is part of Baton Rouge's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Baton Rouge
The latest EPA AirNow observation puts Baton Rouge's AQI at 46 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Baton Rouge air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Baton Rouge, LA), 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.