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, #470 in the world.
About 0 people in these 2 cities breathed unhealthy air on an average day over the last 30 days.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1León de los Aldama 0
- 2Celaya 0
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.
| City | 7-day estimate |
|---|---|
| San Francisco del Rincón | ≈ 14 µg/m³ |
| Valle de Santiago | ≈ 14 µg/m³ |
| Dolores Hidalgo | ≈ 5 µg/m³ |
| Cortazar | ≈ 9 µg/m³ |
| Acámbaro | ≈ 9 µg/m³ |
| Uriangato | ≈ 9 µg/m³ |
| Purísima de Bustos | ≈ 14 µg/m³ |
| Moroleón | ≈ 9 µg/m³ |
| Juventino Rosas | ≈ 9 µg/m³ |
| Pénjamo | ≈ 14 µg/m³ |
| Salvatierra | ≈ 9 µg/m³ |
| Centro Familiar la Soledad | ≈ 9 µg/m³ |
| Marfil | ≈ 8 µg/m³ |
| San Felipe | ≈ 6 µg/m³ |
| Apaseo el Alto | ≈ 9 µg/m³ |
| Villagrán | ≈ 11 µg/m³ |
| Apaseo el Grande | ≈ 9 µg/m³ |
| Yuriria | ≈ 11 µg/m³ |
| Comonfort | ≈ 7 µg/m³ |
| San José Iturbide | ≈ 5 µg/m³ |
| Romita | ≈ 12 µg/m³ |
| Jaral del Progreso | ≈ 11 µg/m³ |
| La Ermita | ≈ 9 µg/m³ |
| Medina | ≈ 9 µg/m³ |
Bad-air episodes in Guanajuato
- Mexico, January 20265 to 9 January 2026, 5 days13 cities128 µg/m³peak, Aguascalientes
- Southern Mexico, January 20261 January 2026, 1 day20 cities182 µg/m³peak, Tlaquepaque
- Southern Mexico, March 202520 March 2025, 1 day8 cities59 µg/m³peak, Irapuato
- Guanajuato, México and Mexico City, Mexico, December 202425 December 2024, 1 day9 cities78 µg/m³peak, Ciudad Nezahualcoyotl
- Southern Mexico, June 20246 to 7 June 2024, 2 days17 cities63 µg/m³peak, Tehuacán
- Southern Mexico, January 20241 January 2024, 1 day17 cities136 µg/m³peak, Salamanca
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, 22:00 UTC, smogrank.com/mx/region/guanajuato?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 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.