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, #430 in the world.

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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	Band
Torreón	≈ 9 µg/m³	Low risk
Ciudad Acuña	≈ 7 µg/m³	Low risk
Monclova	≈ 8 µg/m³	Low risk
Frontera	≈ 8 µg/m³	Low risk
Ramos Arizpe	≈ 10 µg/m³	Low risk
Sabinas	≈ 8 µg/m³	Low risk
Matamoros	≈ 8 µg/m³	Low risk
San Pedro	≈ 8 µg/m³	Low risk
San Pedro	≈ 8 µg/m³	Low risk
Nueva Rosita	≈ 8 µg/m³	Low risk
Ciudad Melchor Múzquiz	≈ 8 µg/m³	Low risk
Parras de la Fuente	≈ 8 µg/m³	Low risk
Francisco I. Madero	≈ 8 µg/m³	Low risk
Castaños	≈ 8 µg/m³	Low risk
Nava	≈ 9 µg/m³	Low risk
Allende	≈ 9 µg/m³	Low risk
San Buenaventura	≈ 8 µg/m³	Low risk
Palaú	≈ 8 µg/m³	Low risk

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SmogRank, most polluted cities in Coahuila, Mexico, PM2.5, last 30 days to 2 Oct 2026, 06:00 UTC, smogrank.com/mx/region/coahuila?w=30d.

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Updated 2026-10-02 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the Canada AQHI+ PM2.5 sub-index.