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 May 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 9 May 2026: San Antonio la Isla 32.9 µg/m³, San Salvador Tizatlalli 32.9 µg/m³ and Aguascalientes 32.8 µg/m³.

  1. 1San Antonio la IslaMéxico32.9
  2. 2San Salvador TizatlalliMéxico32.9
  3. 3AguascalientesAguascalientes32.8
  4. 4San Luis PotosíSan Luis Potosí31.9
  5. 5Hacienda Santa FeJalisco28.2
  6. 6TlaquepaqueJalisco27.4
  7. 7Naucalpan de JuárezMéxico25.2
  8. 8Ciudad NezahualcoyotlMéxico23.5
  9. 9PueblaPuebla23.4
  10. 10MoreliaMichoacán22.9
  11. 11Victoria de DurangoDurango22.9
  12. 12CelayaGuanajuato22.9
  13. 13Atotonilco de TulaHidalgo22.8
  14. 14Santiago de QuerétaroQuerétaro21.7
  15. 15Zacatepec de HidalgoMorelos21.2
  16. 16IrapuatoGuanajuato21.0
  17. 17GuadalajaraJalisco21.0
  18. 18Mixquiahuala de JuárezHidalgo20.8
  19. 19Mexico CityMexico City20.4
  20. 20YecapixtlaMorelos20.3

+ 31 more cities, 20.3 µg/m³ and below

Not counted on this day, too few days measured: Xonacatlán since 8 May 2026, Silao de la Victoria since 7 May 2026, Tuxtla since 5 May 2026 and 4 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.