McAllen Air Quality in Fall
Across 2019–2025, McAllen's fall (September–November) air quality had a median AQI of 40 (Good) over 637 monitored days in the McAllen-Edinburg-Mission, TX 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 69.5% of days. The cleanest fall on record here was 2023 (median AQI 34, 0 days above 100) and the worst was 2021 (median 46, 1 day above 100, peak AQI 105).
- Good: 72.4%
- Moderate: 27.5%
- Unhealthy for Sensitive Groups: 0.2%
- Unhealthy or worse: 0.0%
Improve Indoor Air Quality
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How is the air in McAllen in fall?
Good on a typical day: median AQI 40 across 2019–2025, with 0.2% of fall days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓72.4% of fall days were Good (AQI 0–50), 27.5% Moderate (51–100).
- ✓1 day of 637 reached AQI 101+; the fall peak was 105.
- ✓Cleanest month: November; worst month: September.
Frequently asked questions
What is the air quality like in McAllen in fall?▾
Across 2019–2025, the median daily AQI in McAllen in fall was 40 (Good). 72.4% of days were Good, 27.5% 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 McAllen?▾
A typical fall day in McAllen sits in the Good range (median AQI 40), 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 McAllen's fall air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 69.5% of fall days in McAllen. The highest fall AQI recorded in 2019–2025 was 105 (Unhealthy for Sensitive Groups), in 2021.
McAllen fall air quality, year by year
McAllen fall air quality by year (McAllen-Edinburg-Mission, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 91 | 41 | 0 | 72 | PM2.5 |
| 2020 | 91 | 38 | 0 | 86 | PM2.5 |
| 2021worst | 91 | 46 | 1 | 105 | PM2.5 |
| 2022 | 91 | 37 | 0 | 100 | O3 |
| 2023cleanest | 91 | 34 | 0 | 62 | PM2.5 |
| 2024 | 91 | 42 | 0 | 84 | PM2.5 |
| 2025 | 91 | 45 | 0 | 71 | PM2.5 |
What fall air means in McAllen
A typical fall day in McAllen sits in the Good range (median AQI 40), 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 40 is below McAllen's whole-year median of 50, 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 McAllen runs in line with the national Fall norm; 0.2% of its Fall days topped AQI 100 versus 1.5% nationally (below average).
Within the season, November is the cleanest month (median AQI 38, 0.0% of days above 100) and September the worst (median 41, 0.5% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in McAllen
The latest EPA AirNow observation puts McAllen's AQI at 47 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current McAllen air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (McAllen-Edinburg-Mission, 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.