Laredo Best & Worst AQI Days: Air Quality Guide
The worst air quality day on record for Laredo (Laredo, TX area) was June 27, 2020, when the daily AQI reached 163 (Unhealthy), set by fine particulate matter (PM2.5), in wildfire smoke season. Across 2,553 monitored days in 2019–2025, 1 of the 10 worst days was Unhealthy (AQI 151+) or worse; 5 of the 10 were driven by ground-level ozone and 4 by fine particulate matter (PM2.5), and 3 of them fell in 2024. The cleanest day was January 31, 2023 at AQI 8 (Good); the 10 best days span 4 different years.
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
As an Amazon Associate, we earn from qualifying purchases.
When were Laredo's worst and best air quality days?
Worst: June 27, 2020, AQI 163 (Unhealthy, PM2.5). Best: January 31, 2023, AQI 8 (Good). Based on 2,553 EPA-monitored days in the Laredo, TX area, 2019–2025.
- ✓1 of the 10 worst days were Unhealthy (AQI 151+) or worse; the 10th-worst was AQI 112 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone drove 5 of the 10 worst days.
- ✓2024 accounts for 3 of the 10 worst days.
Frequently asked questions
What was the worst air quality day in Laredo?▾
June 27, 2020: the Laredo, TX area's daily AQI hit 163 (Unhealthy), driven by fine particulate matter (PM2.5), in wildfire smoke season. That is the highest of 2,553 monitored days in 2019–2025.
What was the best air quality day in Laredo?▾
January 31, 2023, with a daily AQI of 8 (Good). The daily AQI is the highest reading from any monitor in the area, so even the cleanest day reflects the area's worst monitor.
What was Laredo's worst air quality day in 2025?▾
November 9, 2025, AQI 121 (Unhealthy for Sensitive Groups), set by coarse dust (PM10).
Which pollutant causes Laredo's worst air days?▾
Ground-level ozone set the AQI on 5 of the 10 worst days; fine particulate matter (PM2.5) on 4. The tables above list the defining pollutant for every day.
Laredo's 10 worst air quality days, 2019–2025
Highest daily AQI recorded for the Laredo, TX area (EPA AQS). The daily AQI is the highest reading from any monitor in the area that day.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2020 page) | 163 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 2 | (2023 page) | 133 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 3 | (2024 page) | 129 | Unhealthy for Sensitive Groups | O3 — ground-level ozone |
| 4 | (2023 page) | 129 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 5 | (2025 page) | 121 | Unhealthy for Sensitive Groups | PM10 — coarse dust (PM10) |
| 6 | (2024 page) | 119 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5) |
| 7 | (2024 page) | 117 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5) |
| 8 | (2025 page) | 115 | Unhealthy for Sensitive Groups | O3 — ground-level ozone |
| 9 | (2022 page) | 114 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 10 | (2025 page) | 112 | Unhealthy for Sensitive Groups | O3 — ground-level ozone |
Worst day of each year in Laredo
The single highest-AQI day in each year on record. Click a year for its full month-by-month statistics.
| Year | Worst day | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 2019 | 109 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5) | |
| 2020 | 163 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2021 | 97 | Moderate | O3 — ground-level ozone | |
| 2022 | 114 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2023 | 133 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2024 | 129 | Unhealthy for Sensitive Groups | O3 — ground-level ozone | |
| 2025 | 121 | Unhealthy for Sensitive Groups | PM10 — coarse dust (PM10) |
Laredo's 10 best air quality days, 2019–2025
Lowest daily AQI recorded for the Laredo, TX area. Ties are listed most recent first.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2023 page) | 8 | Good | O3 — ground-level ozone |
| 2 | (2021 page) | 9 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 3 | (2023 page) | 12 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 4 | (2022 page) | 12 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 5 | (2021 page) | 12 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 6 | (2019 page) | 12 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 7 | (2023 page) | 13 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 8 | (2022 page) | 13 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 9 | (2023 page) | 14 | Good | O3 — ground-level ozone, in peak ozone season |
| 10 | (2022 page) | 14 | Good | PM2.5 — fine particulate matter (PM2.5) |
Right now in Laredo
The latest EPA AirNow observation puts Laredo's AQI at 13 (O3). The days above are historical records, 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.