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 to12 May 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 12 May 2026: San Antonio la Isla 33.6 µg/m³, San Salvador Tizatlalli 33.6 µg/m³ and Aguascalientes 33.0 µg/m³.

  1. 1San Antonio la IslaMéxico33.6
  2. 2San Salvador TizatlalliMéxico33.6
  3. 3AguascalientesAguascalientes33.0
  4. 4San Luis PotosíSan Luis Potosí32.0
  5. 5Hacienda Santa FeJalisco28.7
  6. 6TlaquepaqueJalisco26.5
  7. 7Naucalpan de JuárezMéxico25.6
  8. 8PueblaPuebla24.4
  9. 9Ciudad NezahualcoyotlMéxico23.8
  10. 10MoreliaMichoacán23.4
  11. 11CelayaGuanajuato22.8
  12. 12Atotonilco de TulaHidalgo22.7
  13. 13Victoria de DurangoDurango22.6
  14. 14Santiago de QuerétaroQuerétaro21.6
  15. 15IrapuatoGuanajuato21.4
  16. 16GuadalajaraJalisco21.1
  17. 17Mixquiahuala de JuárezHidalgo20.7
  18. 18Mexico CityMexico City20.6
  19. 19Zacatepec de HidalgoMorelos20.4
  20. 20TepicNayarit20.3

+ 33 more cities, 20.1 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.