SmogRank / World / North America / Mexico / Coahuila
Most polluted cities in Coahuila, Mexico
1 measured city, last 30 days; 1 above the WHO 24-hour guideline. Worst: Saltillo at 17.3 µg/m³, #431 in the world.
- 1Saltillo 66▼231
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
Coahuila 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 |
|---|---|
| Torreón | ≈ 9 µg/m³ |
| Ciudad Acuña | ≈ 7 µg/m³ |
| Monclova | ≈ 8 µg/m³ |
| Frontera | ≈ 8 µg/m³ |
| Ramos Arizpe | ≈ 10 µg/m³ |
| Sabinas | ≈ 8 µg/m³ |
| Matamoros | ≈ 8 µg/m³ |
| San Pedro | ≈ 8 µg/m³ |
| San Pedro | ≈ 8 µg/m³ |
| Nueva Rosita | ≈ 8 µg/m³ |
| Ciudad Melchor Múzquiz | ≈ 8 µg/m³ |
| Parras de la Fuente | ≈ 8 µg/m³ |
| Francisco I. Madero | ≈ 8 µg/m³ |
| Castaños | ≈ 8 µg/m³ |
| Nava | ≈ 9 µg/m³ |
| Allende | ≈ 9 µg/m³ |
| San Buenaventura | ≈ 8 µg/m³ |
| Palaú | ≈ 8 µg/m³ |
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SmogRank, most polluted cities in Coahuila, Mexico, PM2.5, last 30 days to 2 Oct 2026, 04:00 UTC, smogrank.com/mx/region/coahuila?w=30d.
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Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.