Brownsville Air Quality in 2023
In 2023, Brownsville's air quality (Brownsville-Harlingen, TX area) had a median daily AQI of 54 (Moderate) across 365 monitored days. 6 days (1.6%) reached Unhealthy for Sensitive Groups or worse, 161 were Good, and the year's peak AQI was 141 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 262 of those days. The cleanest month of 2023 was September (median AQI 33, 0 days above 100) and the worst was May (median 56, 3 days above 100, peak 141).
- Good: 44.1%
- Moderate: 54.2%
- Unhealthy for Sensitive Groups: 1.6%
- Unhealthy or worse: 0.0%
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How was Brownsville's air quality in 2023?
Moderate on a typical day: median AQI 54, with 6 days above AQI 100 out of 365 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 141 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 262 days.
- ✓Cleanest month: September; worst: May.
Frequently asked questions
What was the average AQI in Brownsville in 2023?▾
EPA's Air Quality System puts Brownsville's (Brownsville-Harlingen, TX) median daily AQI for 2023 at 54, which is Moderate. 6 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 141.
Which month had the worst air quality in Brownsville in 2023?▾
The cleanest month of 2023 was September (median AQI 33, 0 days above 100) and the worst was May (median 56, 3 days above 100, peak 141).
Was 2023 a good or bad year for Brownsville's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 4th cleanest by days above AQI 100. 2023's median of 54 is in line with the area's typical annual median of 52.
Brownsville month by month in 2023
Brownsville air quality month by month, 2023 (Brownsville-Harlingen, TX, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 55 | 0 | 89 | PM2.5 |
| February | 28 | 59 | 0 | 91 | PM2.5 |
| March | 31 | 61 | 0 | 90 | PM2.5 |
| April | 30 | 60 | 1 | 108 | PM2.5 |
| Mayworst | 31 | 56 | 3 | 141 | PM2.5 |
| June | 30 | 58 | 1 | 104 | PM2.5 |
| July | 31 | 66 | 0 | 87 | PM2.5 |
| August | 31 | 54 | 1 | 101 | PM2.5 |
| Septembercleanest | 30 | 33 | 0 | 62 | O3 |
| October | 31 | 43 | 0 | 67 | PM2.5 |
| November | 30 | 38 | 0 | 66 | O3 |
| December | 31 | 52 | 0 | 96 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 4th cleanest by days above AQI 100.
2023's median of 54 is in line with the area's typical annual median of 52.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Brownsville
The latest EPA AirNow observation puts Brownsville's AQI at 40 (PM2.5). The figures above are multi-year annual 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.