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.
The worst cities in Mexico for PM2.5 over the 30 days to 28 Apr 2023: Tlaquepaque 61.0 µg/m³, San Mateo Atenco 46.3 µg/m³ and Celaya 36.7 µg/m³.
- 1TlaquepaqueJalisco61.0
- 2San Mateo AtencoMéxico46.3
- 3CelayaGuanajuato36.7
- 4Ciudad Benito JuárezNuevo León35.6
- 5MexicaliBaja California33.6
- 6XonacatlánMéxico31.1
- 7TolucaMéxico30.6
- 8GuadalajaraJalisco30.5
- 9San Francisco TlalcilalcalpanMéxico28.6
- 10Santiaguito TlalcilalcalliMéxico28.6
- 11Tepeji del Río de OcampoHidalgo28.0
- 12Atotonilco de TulaHidalgo27.8
- 13TlaxcoapanHidalgo26.8
- 14Ciudad NezahualcoyotlMéxico26.4
- 15PueblaPuebla24.1
- 16Ciudad JuárezChihuahua23.4
- 17Naucalpan de JuárezMéxico22.8
- 18SalamancaGuanajuato22.5
- 19Mexico CityMexico City22.3
- 20CuernavacaMorelos22.2
+ 21 more cities, the next at 22.2 µg/m³
Not counted on this day, too few days measured: Apizaco since 23 Apr 2023, Zapopan since 23 Apr 2023 and Heroica Matamoros since 12 Apr 2023. Days missing from the source archive fall in this window, so fewer countries are counted.
Cities counted each 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.