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 to9 Oct 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 9 Oct 2026: Tuxtla 25.7 µg/m³, Hacienda Santa Fe 23.6 µg/m³ and Mexicali 23.4 µg/m³.

  1. 1TuxtlaChiapas25.7
  2. 2Hacienda Santa FeJalisco23.6
  3. 3MexicaliBaja California23.4
  4. 4TijuanaBaja California21.8
  5. 5Santa AnitaJalisco17.0
  6. 6GuadalajaraJalisco16.9
  7. 7SaltilloCoahuila16.7
  8. 8Ciudad NezahualcoyotlMéxico16.5
  9. 9Naucalpan de JuárezMéxico15.8
  10. 10AguascalientesAguascalientes15.8
  11. 11PueblaPuebla15.3
  12. 12TlaquepaqueJalisco15.3
  13. 13Mexico CityMexico City13.6
  14. 14Atotonilco de TulaHidalgo13.5
  15. 15Ciudad ApodacaNuevo León12.4
  16. 16Parque Industrial Ciudad MitrasNuevo León12.1
  17. 17Ciudad General EscobedoNuevo León11.7
  18. 18IrapuatoGuanajuato11.6
  19. 19CelayaGuanajuato11.6
  20. 20León de los AldamaGuanajuato11.5

+ 23 more cities, 11.3 µg/m³ and below

Not counted on this day, too few days measured: San Luis de la Paz since 9 Oct 2026, San Antonio la Isla since 4 Oct 2026, San Salvador Tizatlalli since 4 Oct 2026 and 7 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.