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 to11 Jul 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 11 Jul 2026: Hacienda Santa Fe 23.5 µg/m³, Tuxtla 22.9 µg/m³ and Aguascalientes 22.2 µg/m³.

  1. 1Hacienda Santa FeJalisco23.5
  2. 2TuxtlaChiapas22.9
  3. 3AguascalientesAguascalientes22.2
  4. 4Naucalpan de JuárezMéxico21.9
  5. 5Ciudad NezahualcoyotlMéxico20.2
  6. 6MexicaliBaja California20.0
  7. 7TijuanaBaja California17.4
  8. 8PueblaPuebla17.0
  9. 9Atotonilco de TulaHidalgo16.9
  10. 10Mexico CityMexico City16.8
  11. 11Santa CatarinaNuevo León16.6
  12. 12Ciudad General EscobedoNuevo León16.1
  13. 13TlaquepaqueJalisco16.0
  14. 14GuadalajaraJalisco15.0
  15. 15SalamancaGuanajuato14.3
  16. 16León de los AldamaGuanajuato14.3
  17. 17IrapuatoGuanajuato13.8
  18. 18San MarcosHidalgo13.7
  19. 19Ciudad ApodacaNuevo León13.6
  20. 20MonterreyNuevo León13.1

+ 25 more cities, 12.9 µg/m³ and below

Not counted on this day, too few days measured: Mixquiahuala de Juárez since 11 Jul 2026, Morelia since 4 Jul 2026, Santa Anita since 27 Jun 2026 and 8 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.