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 to6 Mar 2026 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 6 Mar 2026: Tuxtla 45.0 µg/m³, Aguascalientes 37.9 µg/m³ and Xonacatlán 34.2 µg/m³.

  1. 1TuxtlaChiapas45.0
  2. 2AguascalientesAguascalientes37.9
  3. 3XonacatlánMéxico34.2
  4. 4Zacatepec de HidalgoMorelos33.7
  5. 5Hacienda Santa FeJalisco30.9
  6. 6San Luis PotosíSan Luis Potosí30.5
  7. 7TlaquepaqueJalisco29.7
  8. 8San Martin Texmelucan de LabastidaPuebla28.2
  9. 9TijuanaBaja California27.8
  10. 10PueblaPuebla26.6
  11. 11Mixquiahuala de JuárezHidalgo25.7
  12. 12Mexico CityMexico City24.8
  13. 13Naucalpan de JuárezMéxico24.7
  14. 14GuadalajaraJalisco22.6
  15. 15MexicaliBaja California22.5
  16. 16TehuacánPuebla22.1
  17. 17CelayaGuanajuato22.1
  18. 18Ciudad Benito JuárezNuevo León21.2
  19. 19Cadereyta JiménezNuevo León20.5
  20. 20Santiago de QuerétaroQuerétaro20.1

+ 25 more cities, 20.1 µg/m³ and below

Not counted on this day, too few days measured: Saltillo since 5 Mar 2026, Pachuca de Soto since 2 Mar 2026, Yecapixtla since 17 Feb 2026 and 9 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.