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 to21 Apr 2023 That day's board

The worst cities in Mexico for PM2.5 over the 30 days to 21 Apr 2023: Tlaquepaque 62.2 µg/m³, San Mateo Atenco 45.5 µg/m³ and Ciudad Benito Juárez 36.3 µg/m³.

  1. 1TlaquepaqueJalisco62.2
  2. 2San Mateo AtencoMéxico45.5
  3. 3Ciudad Benito JuárezNuevo León36.3
  4. 4CelayaGuanajuato35.9
  5. 5MexicaliBaja California33.2
  6. 6XonacatlánMéxico31.6
  7. 7San Francisco TlalcilalcalpanMéxico31.5
  8. 8Santiaguito TlalcilalcalliMéxico31.5
  9. 9GuadalajaraJalisco31.5
  10. 10ZapopanJalisco30.9
  11. 11TolucaMéxico30.6
  12. 12Atotonilco de TulaHidalgo28.4
  13. 13Tepeji del Río de OcampoHidalgo27.7
  14. 14Ciudad NezahualcoyotlMéxico27.6
  15. 15TlaxcoapanHidalgo25.8
  16. 16PueblaPuebla24.7
  17. 17Naucalpan de JuárezMéxico24.1
  18. 18Mexico CityMexico City23.1
  19. 19GarcíaNuevo León22.4
  20. 20SalamancaGuanajuato22.3

+ 23 more cities, 22.3 µg/m³ and below

Not counted on this day, too few days measured: Heroica Matamoros since 12 Apr 2023. Days missing from the source archive fall in this window, so fewer countries are counted.

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.