Brownsville Air Quality in Spring
Across 2019–2025, Brownsville's spring (March–May) air quality had a median AQI of 61 (Moderate) over 644 monitored days in the Brownsville-Harlingen, TX area. 8.7% of spring days (56 of 644) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 85.4% of days. The cleanest spring on record here was 2019 (median AQI 58, 0 days above 100) and the worst was 2024 (median 98, 42 days above 100, peak AQI 171).
- Good: 18.9%
- Moderate: 72.4%
- Unhealthy for Sensitive Groups: 7.0%
- Unhealthy or worse: 1.7%
Improve Indoor Air Quality
Even with good outdoor air in Brownsville, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
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How is the air in Brownsville in spring?
Moderate on a typical day: median AQI 61 across 2019–2025, with 8.7% of spring days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓18.9% of spring days were Good (AQI 0–50), 72.4% Moderate (51–100).
- ✓56 days of 644 reached AQI 101+; the spring peak was 171.
- ✓Cleanest month: March; worst month: May.
Frequently asked questions
What is the air quality like in Brownsville in spring?▾
Across 2019–2025, the median daily AQI in Brownsville in spring was 61 (Moderate). 18.9% of days were Good, 72.4% Moderate, and 8.7% reached Unhealthy for Sensitive Groups or worse, based on 644 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Brownsville?▾
A typical spring day in Brownsville is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 11 of spring days (8.7%) 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 spring air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 85.4% of spring days in Brownsville. The highest spring AQI recorded in 2019–2025 was 171 (Unhealthy), in 2024.
Brownsville spring air quality, year by year
Brownsville spring air quality by year (Brownsville-Harlingen, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 92 | 58 | 0 | 89 | PM2.5 |
| 2020 | 92 | 61 | 5 | 154 | PM2.5 |
| 2021 | 92 | 58 | 0 | 87 | PM2.5 |
| 2022 | 92 | 59 | 0 | 92 | PM2.5 |
| 2023 | 92 | 61 | 4 | 141 | PM2.5 |
| 2024worst | 92 | 98 | 42 | 171 | PM2.5 |
| 2025 | 92 | 60 | 5 | 139 | PM2.5 |
What spring air means in Brownsville
A typical spring day in Brownsville is Moderate (median AQI 61): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 11 of spring days (8.7%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Spring's median AQI of 61 is above Brownsville's whole-year median of 52, making it one of the area's dirtier periods. Nationally, the median Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Brownsville runs above the national Spring norm; 8.7% of its Spring days topped AQI 100 versus 0.8% nationally (above average).
Within the season, March is the cleanest month (median AQI 59, 3.7% of days above 100) and May the worst (median 62, 13.8% above 100).
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 season 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.