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 14 May 2025: Cholula 40.4 µg/m³, Ciudad Nezahualcoyotl 33.9 µg/m³ and Victoria de Durango 32.9 µg/m³.
- 1CholulaPuebla40.4
- 2Ciudad NezahualcoyotlMéxico33.9
- 3Victoria de DurangoDurango32.9
- 4Hacienda Santa FeJalisco30.8
- 5San Martin Texmelucan de LabastidaPuebla30.7
- 6Ciudad JuárezChihuahua29.1
- 7TehuacánPuebla28.8
- 8PueblaPuebla28.6
- 9Mixquiahuala de JuárezHidalgo28.3
- 10TlaquepaqueJalisco27.9
- 11Atotonilco de TulaHidalgo27.6
- 12IrapuatoGuanajuato26.3
- 13Mexico CityMexico City26.0
- 14MoreliaMichoacán25.1
- 15Tepeji del Río de OcampoHidalgo24.4
- 16GarcíaNuevo León24.2
- 17TlaxcoapanHidalgo23.8
- 18TulancingoHidalgo23.7
- 19GuadalajaraJalisco22.7
- 20Zacatepec de HidalgoMorelos22.6
+ 26 more cities, 21.6 µg/m³ and below
Not counted on this day, too few days measured: San Luis de la Paz since 14 May 2025, Cuernavaca since 13 May 2025, Jardines de la Silla since 12 May 2025 and 10 more cities.
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 readers for them. Most cities there are missing from this board, not clean. Why.