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 Feb 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 4 Feb 2026: Tlaquepaque 38.2 µg/m³, Aguascalientes 37.0 µg/m³ and Hacienda Santa Fe 36.3 µg/m³.

  1. 1TlaquepaqueJalisco38.2
  2. 2AguascalientesAguascalientes37.0
  3. 3Hacienda Santa FeJalisco36.3
  4. 4TijuanaBaja California34.5
  5. 5XonacatlánMéxico33.0
  6. 6San Luis PotosíSan Luis Potosí28.2
  7. 7GuadalajaraJalisco27.9
  8. 8Zacatepec de HidalgoMorelos26.0
  9. 9Naucalpan de JuárezMéxico24.5
  10. 10MexicaliBaja California24.1
  11. 11Mexico CityMexico City24.0
  12. 12Santa AnitaJalisco20.8
  13. 13San Martin Texmelucan de LabastidaPuebla20.7
  14. 14PueblaPuebla20.7
  15. 15San MarcosHidalgo20.6
  16. 16La Providencia Siglo XXIHidalgo19.7
  17. 17ApizacoTlaxcala18.4
  18. 18Santiago de QuerétaroQuerétaro17.9
  19. 19TlaxcalaTlaxcala17.8
  20. 20León de los AldamaGuanajuato17.2

+ 19 more cities, 17.0 µg/m³ and below

Not counted on this day, too few days measured: Parque Industrial Ciudad Mitras since 4 Feb 2026, Silao de la Victoria since 3 Feb 2026, Guanajuato since 1 Feb 2026 and 18 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.