McAllen Air Quality in March
Across 2019–2025, McAllen's March air quality had a median AQI of 54 (Moderate) over 217 monitored days in the McAllen-Edinburg-Mission, TX area. 0.9% of March days (2 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 79.3% of days. The cleanest March on record here was 2019 (median AQI 52, 0 days above 100) and the worst was 2025 (median 61, 2 days above 100, peak AQI 140).
- Good: 33.6%
- Moderate: 65.4%
- Unhealthy for Sensitive Groups: 0.9%
- Unhealthy or worse: 0.0%
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How is the air in McAllen in March?
Moderate on a typical day: median AQI 54 across 2019–2025, with 0.9% of March days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓33.6% of March days were Good (AQI 0–50), 65.4% Moderate (51–100).
- ✓2 days of 217 reached AQI 101+; the March peak was 140.
- ✓Best March: 2019; worst March: 2025.
Frequently asked questions
What is the air quality like in McAllen in March?▾
Across 2019–2025, the median daily AQI in McAllen in March was 54 (Moderate). 33.6% of days were Good, 65.4% Moderate, and 0.9% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in McAllen?▾
A typical March day in McAllen is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of March days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes McAllen's March air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 79.3% of March days in McAllen. The highest March AQI recorded in 2019–2025 was 140 (Unhealthy for Sensitive Groups), in 2025.
McAllen March air quality, year by year
McAllen March air quality by year (McAllen-Edinburg-Mission, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 31 | 52 | 0 | 82 | PM2.5 |
| 2020 | 31 | 56 | 0 | 71 | PM2.5 |
| 2021 | 31 | 54 | 0 | 83 | PM2.5 |
| 2022 | 31 | 53 | 0 | 67 | PM2.5 |
| 2023 | 31 | 57 | 0 | 79 | PM2.5 |
| 2024 | 31 | 58 | 0 | 96 | PM2.5 |
| 2025worst | 31 | 61 | 2 | 140 | PM2.5 |
What March air means in McAllen
A typical March day in McAllen is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of March days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
March's median AQI of 54 is above McAllen's whole-year median of 50, making it one of the area's dirtier periods. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so McAllen runs above the national March norm; 0.9% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of McAllen's spring season (March, April, May); the spring page pools all three months.
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 month 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.