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 Jan 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 9 Jan 2026: Tlaquepaque 79.8 µg/m³, Aguascalientes 58.8 µg/m³ and Hacienda Santa Fe 52.9 µg/m³.

  1. 1TlaquepaqueJalisco79.8
  2. 2AguascalientesAguascalientes58.8
  3. 3Hacienda Santa FeJalisco52.9
  4. 4TijuanaBaja California45.9
  5. 5GuadalajaraJalisco44.9
  6. 6Ciudad Benito JuárezNuevo León41.3
  7. 7XonacatlánMéxico39.3
  8. 8Ciudad NezahualcoyotlMéxico35.9
  9. 9San Antonio la IslaMéxico33.3
  10. 10San Salvador TizatlalliMéxico33.3
  11. 11MexicaliBaja California30.8
  12. 12Zacatepec de HidalgoMorelos30.7
  13. 13San Luis PotosíSan Luis Potosí30.5
  14. 14IrapuatoGuanajuato29.9
  15. 15Santa AnitaJalisco27.7
  16. 16PueblaPuebla25.8
  17. 17Silao de la VictoriaGuanajuato25.5
  18. 18Mexico CityMexico City25.1
  19. 19Cadereyta JiménezNuevo León24.2
  20. 20CuernavacaMorelos24.0

+ 31 more cities, 23.9 µg/m³ and below

Not counted on this day, too few days measured: Apizaco since 2 Jan 2026, Saltillo since 1 Jan 2026, Yecapixtla since 31 Dec 2025 and 6 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.