SmogRank / World / Mexico / May 2023

Most polluted cities in Mexico, May 2023

12 cities in Mexico ranked by their average PM2.5 over the 31 days. Worst: Celaya at 37.9 µg/m³, #37 of 1,543 cities in the world. Cleanest: Nogales at 8.0. 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.

← Celaya 58% 50%0
Every city in Mexico ranked for May 2023, 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
    58%
  2. 2SalamancaGuanajuato
    19%
  3. 3León de los AldamaGuanajuato
    17%
  4. 4IrapuatoGuanajuato
    15%
  5. 5Silao de la VictoriaGuanajuato
    14%
  6. 6GuanajuatoGuanajuato
    11%
  7. 7AbasoloGuanajuato
    7%
  8. 8Mexico CityMexico City
    3%
  9. 9Ciudad JuárezChihuahua
    3%
  10. 10San Miguel de AllendeGuanajuato
    0%
  11. 11San Luis de la PazGuanajuato
    0%
  12. 12NogalesSonora
    0%
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 2023 · Mexico now

Regions

Chihuahua 1Guanajuato 9Mexico City 1Sonora 1

Ranked cities in each region, May 2023.

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SmogRank, most polluted cities in Mexico, PM2.5, May 2023, smogrank.com/mx/history/2023-05 (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.