Brownsville Air Quality in April
Across 2019–2025, Brownsville's April air quality had a median AQI of 62 (Moderate) over 210 monitored days in the Brownsville-Harlingen, TX area. 8.6% of April days (18 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 79.0% of days. The cleanest April on record here was 2019 (median AQI 58, 0 days above 100) and the worst was 2024 (median 86, 12 days above 100, peak AQI 157).
- Good: 20.0%
- Moderate: 71.4%
- Unhealthy for Sensitive Groups: 6.7%
- Unhealthy or worse: 1.9%
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How is the air in Brownsville in April?
Moderate on a typical day: median AQI 62 across 2019–2025, with 8.6% of April days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓20.0% of April days were Good (AQI 0–50), 71.4% Moderate (51–100).
- ✓18 days of 210 reached AQI 101+; the April peak was 157.
- ✓Best April: 2019; worst April: 2024.
Frequently asked questions
What is the air quality like in Brownsville in April?▾
Across 2019–2025, the median daily AQI in Brownsville in April was 62 (Moderate). 20.0% of days were Good, 71.4% Moderate, and 8.6% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in Brownsville?▾
A typical April day in Brownsville is Moderate (median AQI 62): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 12 of April days (8.6%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Brownsville's April air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 79.0% of April days in Brownsville. The highest April AQI recorded in 2019–2025 was 157 (Unhealthy), in 2024.
Brownsville April air quality, year by year
Brownsville April air quality by year (Brownsville-Harlingen, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 30 | 58 | 0 | 89 | O3 |
| 2020 | 30 | 63 | 5 | 154 | PM2.5 |
| 2021 | 30 | 68 | 0 | 87 | PM2.5 |
| 2022 | 30 | 60 | 0 | 85 | PM2.5 |
| 2023 | 30 | 60 | 1 | 108 | PM2.5 |
| 2024worst | 30 | 86 | 12 | 157 | PM2.5 |
| 2025 | 30 | 60 | 0 | 83 | PM2.5 |
What April air means in Brownsville
A typical April day in Brownsville is Moderate (median AQI 62): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 12 of April days (8.6%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
April's median AQI of 62 is above Brownsville's whole-year median of 52, making it one of the area's dirtier periods. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Brownsville runs above the national April norm; 8.6% of its April days topped AQI 100 versus 0.7% nationally (above average).
April is part of Brownsville's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Brownsville
The latest EPA AirNow observation puts Brownsville's AQI at 43 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Brownsville air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Brownsville-Harlingen, 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.