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 to5 Apr 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 5 Apr 2026: Victoria de Durango 33.7 µg/m³, Aguascalientes 32.4 µg/m³ and Xonacatlán 30.8 µg/m³.

  1. 1Victoria de DurangoDurango33.7
  2. 2AguascalientesAguascalientes32.4
  3. 3XonacatlánMéxico30.8
  4. 4San Antonio la IslaMéxico29.2
  5. 5San Salvador TizatlalliMéxico29.2
  6. 6TlaquepaqueJalisco26.4
  7. 7Hacienda Santa FeJalisco25.8
  8. 8MexicaliBaja California25.1
  9. 9PueblaPuebla23.5
  10. 10Zacatepec de HidalgoMorelos22.6
  11. 11Mixquiahuala de JuárezHidalgo21.7
  12. 12CelayaGuanajuato21.2
  13. 13Atotonilco de TulaHidalgo20.8
  14. 14TijuanaBaja California20.8
  15. 15YecapixtlaMorelos20.3
  16. 16Tetela del VolcánMorelos20.3
  17. 17TehuacánPuebla19.9
  18. 18Mexico CityMexico City19.8
  19. 19GuadalajaraJalisco19.4
  20. 20Ciudad NezahualcoyotlMéxico19.2

+ 30 more cities, 18.1 µg/m³ and below

Not counted on this day, too few days measured: San Francisco Tlalcilalcalpan since 5 Apr 2026, Santiaguito Tlalcilalcalli since 5 Apr 2026, Naucalpan de Juárez since 31 Mar 2026 and 7 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.