SmogRank / World / Mexico / February 2025

Most unhealthy days in Mexico, February 2025

10 cities in Mexico ranked by their share of unhealthy days over the 28 days. The most unhealthy days: Irapuato, Mexico, 1 of 27 measured days. A city needs measurements on 70% of the days to be ranked.

Mexico has 42 cities ranked over the last 30 days, but only 10 here: most of its monitors have no readings for February 2025 in OpenAQ's archive, where ours come from, or too few to rank. Cities missing from this board weren't clean, just not measured.

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.

← Irapuato 4% 3%0
Every city in Mexico ranked for February 2025, 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. 1IrapuatoGuanajuato
    1 of 27
  2. 2TijuanaBaja California
    1 of 28
  3. 3León de los AldamaGuanajuato
    0 of 24
  4. 4San Luis de la PazGuanajuato
    0 of 27
  5. 5CelayaGuanajuato
    0 of 27
  6. 6AbasoloGuanajuato
    0 of 24
  7. 7SalamancaGuanajuato
    0 of 25
  8. 8GuanajuatoGuanajuato
    0 of 22
  9. 9San Miguel de AllendeGuanajuato
    0 of 26
  10. 10Heroica MatamorosTamaulipas
    0 of 27
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, February 2025 · Mexico now

Regions

Baja California 1Guanajuato 8Tamaulipas 1

Ranked cities in each region, February 2025.

Use this board

SmogRank, most polluted cities in Mexico, by unhealthy days, PM2.5, February 2025, smogrank.com/mx/history/2025-02?by=days (accessed 7 Oct 2026).

Download top 10 by average (PNG)

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.