SmogRank / World / Mexico / May 2024

Most unhealthy days in Mexico, May 2024

10 cities in Mexico ranked by their share of unhealthy days over the 31 days. The most unhealthy days: Celaya, Mexico, 10 of 31 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 May 2024 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.

← Celaya 32% 30%0
Every city in Mexico ranked for May 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. 1CelayaGuanajuato
    10 of 31
  2. 2Heroica MatamorosTamaulipas
    7 of 30
  3. 3San Luis de la PazGuanajuato
    2 of 31
  4. 4IrapuatoGuanajuato
    1 of 31
  5. 5SalamancaGuanajuato
    1 of 31
  6. 6León de los AldamaGuanajuato
    0 of 31
  7. 7San Miguel de AllendeGuanajuato
    0 of 31
  8. 8GuanajuatoGuanajuato
    0 of 24
  9. 9AbasoloGuanajuato
    0 of 28
  10. 10NogalesSonora
    0 of 31
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, May 2024 · Mexico now

Regions

Guanajuato 8Sonora 1Tamaulipas 1

Ranked cities in each region, May 2024.

Use this board

SmogRank, most polluted cities in Mexico, by unhealthy days, PM2.5, May 2024, smogrank.com/mx/history/2024-05?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.