Dallas Air Quality in September
Across 2019–2025, Dallas's September air quality had a median AQI of 68 (Moderate) over 210 monitored days in the Dallas-Fort Worth-Arlington, TX area. 28.1% of September days (59 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 73.8% of days. The cleanest September on record here was 2020 (median AQI 54, 0 days above 100) and the worst was 2023 (median 99, 14 days above 100, peak AQI 151).
- Good: 21.9%
- Moderate: 50.0%
- Unhealthy for Sensitive Groups: 25.2%
- Unhealthy or worse: 2.9%
Extra Protection for Dallas Homes
Air quality in Dallas is moderate (AQI 55), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in Dallas in September?
Moderate on a typical day: median AQI 68 across 2019–2025, with 28.1% of September days above AQI 100. Ground-level ozone is the main driver.
- ✓21.9% of September days were Good (AQI 0–50), 50.0% Moderate (51–100).
- ✓59 days of 210 reached AQI 101+; the September peak was 179.
- ✓Best September: 2020; worst September: 2023.
Frequently asked questions
What is the air quality like in Dallas in September?▾
Across 2019–2025, the median daily AQI in Dallas in September was 68 (Moderate). 21.9% of days were Good, 50.0% Moderate, and 28.1% 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 Dallas?▾
A typical September day in Dallas is Moderate (median AQI 68): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 4 of September days (28.1%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Dallas's September air quality problems?▾
Ground-level ozone set the daily AQI on 73.8% of September days in Dallas. The highest September AQI recorded in 2019–2025 was 179 (Unhealthy), in 2023.
Dallas September air quality, year by year
Dallas September air quality by year (Dallas-Fort Worth-Arlington, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 54 | 7 | 156 | O3 |
| 2020cleanest | 30 | 54 | 0 | 97 | PM2.5 |
| 2021 | 30 | 73 | 9 | 159 | O3 |
| 2022 | 30 | 92 | 12 | 133 | O3 |
| 2023worst | 30 | 99 | 14 | 151 | O3 |
| 2024 | 30 | 66 | 3 | 156 | O3 |
| 2025 | 30 | 97 | 14 | 179 | O3 |
What September air means in Dallas
A typical September day in Dallas is Moderate (median AQI 68): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 4 of September days (28.1%) 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 68 is above Dallas's whole-year median of 58, making it one of the area's dirtier periods. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Dallas runs above the national September norm; 28.1% of its September days topped AQI 100 versus 2.7% nationally (above average).
September is part of Dallas's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Dallas
The latest EPA AirNow observation puts Dallas's AQI at 55 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Dallas air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Dallas-Fort Worth-Arlington, TX), 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.