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 to25 Sep 2023 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 25 Sep 2023: Xonacatlán 30.0 µg/m³, Mexicali 28.0 µg/m³ and San Francisco Tlalcilalcalpan 26.7 µg/m³.

  1. 1XonacatlánMéxico30.0
  2. 2MexicaliBaja California28.0
  3. 3San Francisco TlalcilalcalpanMéxico26.7
  4. 4Santiaguito TlalcilalcalliMéxico26.7
  5. 5San Antonio la IslaMéxico26.0
  6. 6San Salvador TizatlalliMéxico26.0
  7. 7ZapopanJalisco25.8
  8. 8TlaquepaqueJalisco25.0
  9. 9TolucaMéxico24.9
  10. 10CuernavacaMorelos20.1
  11. 11MoreliaMichoacán20.0
  12. 12Ciudad ApodacaNuevo León19.3
  13. 13Ciudad NezahualcoyotlMéxico19.2
  14. 14GuadalajaraJalisco19.1
  15. 15TijuanaBaja California18.6
  16. 16Naucalpan de JuárezMéxico18.0
  17. 17Ciudad JuárezChihuahua18.0
  18. 18Santa CatarinaNuevo León17.5
  19. 19SaltilloCoahuila17.5
  20. 20SalamancaGuanajuato16.4

+ 22 more cities, the next at 15.0 µg/m³

Not counted on this day, too few days measured: Apizaco since 25 Sep 2023, Tepeji del Río de Ocampo since 23 Sep 2023, Irapuato since 18 Sep 2023 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 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.