Laredo Air Quality in September
Across 2019–2025, Laredo's September air quality had a median AQI of 43 (Good) over 210 monitored days in the Laredo, TX area. 1.9% of September days (4 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 66.2% of days. The cleanest September on record here was 2022 (median AQI 33, 0 days above 100) and the worst was 2025 (median 46, 2 days above 100, peak AQI 108).
- Good: 68.6%
- Moderate: 29.5%
- Unhealthy for Sensitive Groups: 1.9%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Laredo
Today's main pollutant in Laredo is ground-level ozone (AQI 13). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Laredo in September?
Good on a typical day: median AQI 43 across 2019–2025, with 1.9% of September days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓68.6% of September days were Good (AQI 0–50), 29.5% Moderate (51–100).
- ✓4 days of 210 reached AQI 101+; the September peak was 108.
- ✓Best September: 2022; worst September: 2025.
Frequently asked questions
What is the air quality like in Laredo in September?▾
Across 2019–2025, the median daily AQI in Laredo in September was 43 (Good). 68.6% of days were Good, 29.5% Moderate, and 1.9% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is September a good time for outdoor exercise in Laredo?▾
A typical September day in Laredo sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 53 of September days (1.9%) reached AQI 101+ in 2019–2025.
Which pollutant causes Laredo's September air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 66.2% of September days in Laredo. The highest September AQI recorded in 2019–2025 was 108 (Unhealthy for Sensitive Groups), in 2025.
Laredo September air quality, year by year
Laredo September air quality by year (Laredo, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 41 | 0 | 61 | PM2.5 |
| 2020 | 30 | 49 | 0 | 76 | PM2.5 |
| 2021 | 30 | 51 | 0 | 86 | PM2.5 |
| 2022cleanest | 30 | 33 | 0 | 57 | PM2.5 |
| 2023 | 30 | 44 | 0 | 93 | O3 |
| 2024 | 30 | 42 | 2 | 108 | O3 |
| 2025worst | 30 | 46 | 2 | 108 | O3 |
What September air means in Laredo
A typical September day in Laredo sits in the Good range (median AQI 43), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 53 of September days (1.9%) reached AQI 101+ in 2019–2025.
September's median AQI of 43 is below Laredo's whole-year median of 47, making it one of the area's cleaner periods. Nationally, the median September AQI across every EPA metro area (100,699 metro-days, 2019–2025) is 43, so Laredo runs in line with the national September norm; 1.9% of its September days topped AQI 100 versus 2.7% nationally (about the same).
September is part of Laredo's fall season (September, October, November); the fall page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Laredo
The latest EPA AirNow observation puts Laredo's AQI at 13 (O3). The figures above are multi-year month statistics, not today's reading.
View current Laredo air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Laredo, 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.