SmogRank / World / Mexico / November 2025

Most people breathing unhealthy air in Mexico, November 2025

18 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: Guadalajara, Mexico, about 718K on an average day. A city needs measurements on 70% of the days to be ranked.

About 1.8M people in these 18 cities breathed unhealthy air on an average day of November 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.

← Guadalajara 718K 700K0
Every city in Mexico ranked for November 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. 1GuadalajaraJalisco
    718K
  2. 2TlaquepaqueJalisco
    282K
  3. 3Ciudad NezahualcoyotlMéxico
    215K
  4. 4AguascalientesAguascalientes
    181K
  5. 5MexicaliBaja California
    172K
  6. 6Ciudad General EscobedoNuevo León
    94.8K
  7. 7PueblaPuebla
    56.4K
  8. 8Ciudad JuárezChihuahua
    50.4K
  9. 9Santa CatarinaNuevo León
    32.6K
  10. 10Mexico CityMexico City
    0
  11. 11ZapopanJalisco
    0
  12. 12CelayaGuanajuato
    0
  13. 13León de los AldamaGuanajuato
    0
  14. 14MonterreyNuevo León
    0
  15. 15TepicNayarit
    0
  16. 15Santiago de QuerétaroQuerétaro
    0
  17. 17Pachuca de SotoHidalgo
    0
  18. 18Victoria de DurangoDurango
    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, November 2025 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chiapas 1Chihuahua 1Durango 1Guanajuato 4Hidalgo 4Jalisco 5México 5Mexico City 1Morelos 2Nayarit 1Nuevo León 7Puebla 3Querétaro 2Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, November 2025.

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SmogRank, most polluted cities in Mexico, by people breathing unhealthy air, PM2.5, November 2025, smogrank.com/mx/history/2025-11?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.