SmogRank / History / City race

Cities in Mexico, worst air first, day by day

Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.

CountriesCities
The 30 days to4 Jul 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 4 Jul 2026: Hacienda Santa Fe 25.6 µg/m³, Aguascalientes 23.2 µg/m³ and Tuxtla 21.5 µg/m³.

  1. 1Hacienda Santa FeJalisco25.6
  2. 2AguascalientesAguascalientes23.2
  3. 3TuxtlaChiapas21.5
  4. 4Naucalpan de JuárezMéxico20.2
  5. 5Ciudad NezahualcoyotlMéxico18.6
  6. 6MexicaliBaja California18.3
  7. 7TijuanaBaja California17.3
  8. 8TlaquepaqueJalisco16.1
  9. 9Atotonilco de TulaHidalgo16.0
  10. 10Mexico CityMexico City15.8
  11. 11Santa CatarinaNuevo León15.7
  12. 12PueblaPuebla15.4
  13. 13Ciudad General EscobedoNuevo León13.9
  14. 14GuadalajaraJalisco13.8
  15. 15San MarcosHidalgo13.5
  16. 16IrapuatoGuanajuato13.5
  17. 17SalamancaGuanajuato13.4
  18. 18Ciudad ApodacaNuevo León13.1
  19. 19Mixquiahuala de JuárezHidalgo12.8
  20. 20León de los AldamaGuanajuato12.5

+ 25 more cities, 12.4 µg/m³ and below

Not counted on this day, too few days measured: Morelia since 4 Jul 2026, Santa Anita since 27 Jun 2026, San Luis Potosí since 21 Jun 2026 and 10 more cities.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that day

A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.

Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites; we are building the readers for them. Most cities there are missing from this board, not clean. Why.