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 17 May 2025: Cholula 39.9 µg/m³, Ciudad Nezahualcoyotl 34.0 µg/m³ and Atlixco 33.6 µg/m³.
- 1CholulaPuebla39.9
- 2Ciudad NezahualcoyotlMéxico34.0
- 3AtlixcoPuebla33.6
- 4Hacienda Santa FeJalisco32.0
- 5Victoria de DurangoDurango30.9
- 6TehuacánPuebla29.7
- 7San Martin Texmelucan de LabastidaPuebla29.7
- 8Mixquiahuala de JuárezHidalgo28.6
- 9PueblaPuebla28.5
- 10TlaquepaqueJalisco27.6
- 11Atotonilco de TulaHidalgo27.3
- 12Ciudad JuárezChihuahua27.0
- 13IrapuatoGuanajuato26.7
- 14Mexico CityMexico City26.2
- 15MoreliaMichoacán26.0
- 16TlaxcalaTlaxcala25.4
- 17TlaxcoapanHidalgo24.8
- 18Tepeji del Río de OcampoHidalgo24.5
- 19TulancingoHidalgo24.4
- 20Ciudad Benito JuárezNuevo León24.2
+ 28 more cities, 23.5 µg/m³ and below
Not counted on this day, too few days measured: García since 16 May 2025, San Luis de la Paz since 14 May 2025, Cuernavaca since 13 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 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.