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.

About 915K people in these 4 cities breathed unhealthy air on an average day of May 2023.

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.

← Mexico City 397K 300K0
Every city in Mexico ranked for May 2023 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Mexico CityMexico City
    397K
  2. 2León de los AldamaGuanajuato
    272K
  3. 3CelayaGuanajuato
    198K
  4. 4Ciudad JuárezChihuahua
    48.8K
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.

Use this board

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.