SmogRank / World / North America / Mexico / Guanajuato

Most polluted cities in Guanajuato, Mexico

8 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Salamanca at 12.2 µg/m³, #471 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.

Guanajuato: 8 measured citiesHidalgo: 5 measured citiesJalisco: 5 measured citiesMéxico: 2 measured citiesMichoacánQuerétaro: 2 measured citiesSan Luis PotosíZacatecasAguascalientes: 1 measured city#8 Guanajuato: 6.6 µg/m³#7 San Miguel de Allende: 7.1 µg/m³#6 Abasolo: 7.6 µg/m³#5 San Luis de la Paz: 9.8 µg/m³#4 Celaya: 12.0 µg/m³#2 León de los Aldama: 12.1 µg/m³#3 Irapuato: 12.1 µg/m³#1 Salamanca: 12.2 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Irapuato 4% 3%0
Every measured city in Guanajuato, Mexico, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

Guanajuato 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.

City7-day estimateBand
San Francisco del Rincón≈ 14 µg/m³Moderate
Valle de Santiago≈ 14 µg/m³Moderate
Dolores Hidalgo≈ 5 µg/m³Good
Cortazar≈ 9 µg/m³Moderate
Acámbaro≈ 9 µg/m³Good
Uriangato≈ 9 µg/m³Moderate
Purísima de Bustos≈ 14 µg/m³Moderate
Moroleón≈ 9 µg/m³Moderate
Juventino Rosas≈ 9 µg/m³Good
Pénjamo≈ 14 µg/m³Moderate
Salvatierra≈ 9 µg/m³Moderate
Centro Familiar la Soledad≈ 9 µg/m³Good
Marfil≈ 8 µg/m³Good
San Felipe≈ 6 µg/m³Good
Apaseo el Alto≈ 9 µg/m³Moderate
Villagrán≈ 11 µg/m³Moderate
Apaseo el Grande≈ 9 µg/m³Moderate
Yuriria≈ 11 µg/m³Moderate
Comonfort≈ 7 µg/m³Good
San José Iturbide≈ 5 µg/m³Good
Romita≈ 12 µg/m³Moderate
Jaral del Progreso≈ 11 µg/m³Moderate
La Ermita≈ 9 µg/m³Good
Medina≈ 9 µg/m³Good

Bad-air episodes in Guanajuato

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

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SmogRank, most polluted cities in Guanajuato, Mexico, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/mx/region/guanajuato?w=30d.

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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.