SmogRank / World / Mexico / April 2025

Most people breathing unhealthy air in Mexico, April 2025

17 cities in Mexico measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 30 days. The most people breathing unhealthy air: Mexico City, Mexico, about 820K on an average day. A city needs measurements on 70% of the days to be ranked.

About 2.26M people in these 17 cities breathed unhealthy air on an average day of April 2025.

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 820K 800K0
Every city in Mexico ranked for April 2025 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
    820K
  2. 2Ciudad NezahualcoyotlMéxico
    287K
  3. 3Victoria de DurangoDurango
    286K
  4. 4TlaquepaqueJalisco
    282K
  5. 5Ciudad JuárezChihuahua
    252K
  6. 6AguascalientesAguascalientes
    120K
  7. 7MexicaliBaja California
    115K
  8. 8León de los AldamaGuanajuato
    60.8K
  9. 9MonterreyNuevo León
    37.9K
  10. 10PueblaPuebla
    0
  11. 11GuadalajaraJalisco
    0
  12. 12TepicNayarit
    0
  13. 13ZapopanJalisco
    0
  14. 14CelayaGuanajuato
    0
  15. 15Ciudad General EscobedoNuevo León
    0
  16. 16Santa CatarinaNuevo León
    0
  17. 17Pachuca de SotoHidalgo
    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, April 2025 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chihuahua 2Coahuila 1Durango 1Guanajuato 8Hidalgo 6Jalisco 5México 1Mexico City 1Morelos 2Nayarit 1Nuevo León 7Puebla 3Querétaro 1San Luis Potosí 1Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, April 2025.

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SmogRank, most polluted cities in Mexico, by people breathing unhealthy air, PM2.5, April 2025, smogrank.com/mx/history/2025-04?by=people (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.