SmogRank / World / North America / Mexico / Tamaulipas
Most polluted cities in Tamaulipas, Mexico
1 measured city, last 30 days; 0 above the WHO 24-hour guideline. The only one: Heroica Matamoros at 9.5 µg/m³, #702 in the world.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Estimated: cities without a monitor
Tamaulipas cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Reynosa | ≈ 10 µg/m³ |
| Nuevo Laredo | ≈ 8 µg/m³ |
| Ciudad Victoria | ≈ 5 µg/m³ |
| Tampico | ≈ 7 µg/m³ |
| Ciudad Madero | ≈ 7 µg/m³ |
| Miramar | ≈ 7 µg/m³ |
| Ciudad Río Bravo | ≈ 10 µg/m³ |
| Ciudad Mante | ≈ 7 µg/m³ |
| Altamira | ≈ 7 µg/m³ |
| Valle Hermoso | ≈ 9 µg/m³ |
| San Fernando | ≈ 8 µg/m³ |
| Ciudad Miguel Alemán | ≈ 8 µg/m³ |
Bad-air episodes in Tamaulipas
- Southern United States and Mexico, September 202615 September 2026, 1 day8 cities37 µg/m³peak, Port Isabel
- Southern United States and Mexico, April 202625 to 28 April 2026, 4 days29 cities39 µg/m³peak, Laredo
- Southern United States and Mexico, February 202619 to 20 February 2026, 2 days20 cities48 µg/m³peak, Laredo
- Southern United States and Mexico, March and April 202530 March to 1 April 2025, 3 days9 cities111 µg/m³peak, Saltillo
- United States and Mexico, March 202514 to 15 March 2025, 2 days42 cities78 µg/m³peak, Chanute
- Southern and eastern United States and Mexico, July and August 202431 July to 2 August 2024, 3 days71 cities47 µg/m³peak, Marion
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
Use this board
SmogRank, most polluted cities in Tamaulipas, Mexico, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/mx/region/tamaulipas?w=30d.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.