SmogRank / World / Mexico / July 2025

Most people breathing unhealthy air in Mexico, July 2025

14 cities in Mexico measured at 2 or more places, ranked by how many people breathed unhealthy air on an average day over the 31 days. The most people breathing unhealthy air: Aguascalientes, Mexico, about 23.3K on an average day. A city needs measurements on 70% of the days to be ranked.

About 23.3K people in these 14 cities breathed unhealthy air on an average day of July 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.

← Aguascalientes 23.3K 20K0
Every city in Mexico ranked for July 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. 1AguascalientesAguascalientes
    23.3K
  2. 2Santa CatarinaNuevo León
    0
  3. 3CelayaGuanajuato
    0
  4. 4MonterreyNuevo León
    0
  5. 4León de los AldamaGuanajuato
    0
  6. 6Mexico CityMexico City
    0
  7. 7PueblaPuebla
    0
  8. 8TlaquepaqueJalisco
    0
  9. 9MexicaliBaja California
    0
  10. 10Santiago de QuerétaroQuerétaro
    0
  11. 11Ciudad JuárezChihuahua
    0
  12. 12TepicNayarit
    0
  13. 13Pachuca de SotoHidalgo
    0
  14. 14ZapopanJalisco
    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, July 2025 · Mexico now

Regions

Aguascalientes 1Baja California 2Baja California Sur 1Chiapas 1Chihuahua 2Coahuila 1Guanajuato 5Hidalgo 8Jalisco 2México 3Mexico City 1Morelos 1Nayarit 1Nuevo León 4Puebla 3Querétaro 2San Luis Potosí 1Sonora 1Tamaulipas 1Yucatán 1

Ranked cities in each region, July 2025.

Use this board

SmogRank, most polluted cities in Mexico, by people breathing unhealthy air, PM2.5, July 2025, smogrank.com/mx/history/2025-07?by=people (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.