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 to24 Dec 2023 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 24 Dec 2023: Tlaquepaque 50.5 µg/m³, Victoria de Durango 42.9 µg/m³ and Ciudad Benito Juárez 40.9 µg/m³.

  1. 1TlaquepaqueJalisco50.5
  2. 2Victoria de DurangoDurango42.9
  3. 3Ciudad Benito JuárezNuevo León40.9
  4. 4Santa CatarinaNuevo León30.7
  5. 5VeracruzVeracruz30.5
  6. 6CholulaPuebla30.5
  7. 7ZapopanJalisco30.4
  8. 8TijuanaBaja California29.1
  9. 9San Antonio la IslaMéxico27.9
  10. 10San Salvador TizatlalliMéxico27.9
  11. 11TolucaMéxico27.4
  12. 12MexicaliBaja California27.2
  13. 13GuadalajaraJalisco26.7
  14. 14San Francisco TlalcilalcalpanMéxico26.5
  15. 15Santiaguito TlalcilalcalliMéxico26.5
  16. 16MonterreyNuevo León24.8
  17. 17Ciudad ApodacaNuevo León24.7
  18. 18Ciudad General EscobedoNuevo León23.6
  19. 19SaltilloCoahuila22.2
  20. 20MoreliaMichoacán20.3

+ 24 more cities, the next at 19.7 µg/m³

Not counted on this day, too few days measured: García since 23 Dec 2023, Yecapixtla since 11 Dec 2023, Tetela del Volcán since 11 Dec 2023 and 2 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 reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.