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 to10 Mar 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 10 Mar 2026: Aguascalientes 40.1 µg/m³, San Antonio la Isla 37.7 µg/m³ and San Salvador Tizatlalli 37.7 µg/m³.

  1. 1AguascalientesAguascalientes40.1
  2. 2San Antonio la IslaMéxico37.7
  3. 3San Salvador TizatlalliMéxico37.7
  4. 4Zacatepec de HidalgoMorelos35.0
  5. 5XonacatlánMéxico34.6
  6. 6San Luis PotosíSan Luis Potosí30.8
  7. 7Hacienda Santa FeJalisco29.5
  8. 8TlaquepaqueJalisco28.3
  9. 9PueblaPuebla27.7
  10. 10Mixquiahuala de JuárezHidalgo26.9
  11. 11Naucalpan de JuárezMéxico26.3
  12. 12Mexico CityMexico City26.0
  13. 13TijuanaBaja California25.7
  14. 14CelayaGuanajuato24.8
  15. 15Pachuca de SotoHidalgo24.3
  16. 16TehuacánPuebla23.7
  17. 17Santiago de QuerétaroQuerétaro22.3
  18. 18MexicaliBaja California22.2
  19. 19IrapuatoGuanajuato21.6
  20. 20GuadalajaraJalisco21.2

+ 26 more cities, 21.1 µg/m³ and below

Not counted on this day, too few days measured: Tuxtla since 9 Mar 2026, San Luis de la Paz since 9 Mar 2026, San Martin Texmelucan de Labastida since 7 Mar 2026 and 8 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.