SmogRank / World / Mexico / October 2024

Most unhealthy days in Mexico, October 2024

11 cities in Mexico ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Nogales, Mexico, 0 of 31 measured days. A city needs measurements on 70% of the days to be ranked.

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.

← Nogales 0% 0.75%0
Every city in Mexico ranked for October 2024, 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.
  1. 1NogalesSonora
    0 of 31
  2. 2Silao de la VictoriaGuanajuato
    0 of 23
  3. 3León de los AldamaGuanajuato
    0 of 24
  4. 4IrapuatoGuanajuato
    0 of 24
  5. 5CelayaGuanajuato
    0 of 24
  6. 6SalamancaGuanajuato
    0 of 24
  7. 7San Luis de la PazGuanajuato
    0 of 22
  8. 8AbasoloGuanajuato
    0 of 24
  9. 9GuanajuatoGuanajuato
    0 of 23
  10. 10San Miguel de AllendeGuanajuato
    0 of 24
  11. 11Heroica MatamorosTamaulipas
    0 of 30
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

All cities in the world, October 2024 · Mexico now

Regions

Guanajuato 9Sonora 1Tamaulipas 1

Ranked cities in each region, October 2024.

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SmogRank, most polluted cities in Mexico, by unhealthy days, PM2.5, October 2024, smogrank.com/mx/history/2024-10?by=days (accessed 7 Oct 2026).

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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.