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 16 Jul 2025: Cholula 40.1 µg/m³, Tepeji del Río de Ocampo 20.2 µg/m³ and Atotonilco de Tula 20.0 µg/m³.
- 1CholulaPuebla40.1
- 2Tepeji del Río de OcampoHidalgo20.2
- 3Atotonilco de TulaHidalgo20.0
- 4MexicaliBaja California17.2
- 5La Providencia Siglo XXIHidalgo16.8
- 6ApizacoTlaxcala16.2
- 7Ciudad Benito JuárezNuevo León15.0
- 8Santa CatarinaNuevo León14.7
- 9TijuanaBaja California14.2
- 10SaltilloCoahuila14.1
- 11TlaquepaqueJalisco13.9
- 12Ciudad JuárezChihuahua13.2
- 13PueblaPuebla13.1
- 14Mexico CityMexico City13.0
- 15AguascalientesAguascalientes12.9
- 16MonterreyNuevo León12.8
- 17Parque Industrial Ciudad MitrasNuevo León12.8
- 18San Martin Texmelucan de LabastidaPuebla12.3
- 19Mixquiahuala de JuárezHidalgo12.0
- 20TulancingoHidalgo10.9
+ 14 more cities, 10.5 µg/m³ and below
Not counted on this day, too few days measured: García since 13 Jul 2025, Victoria de Durango since 11 Jul 2025, Atlixco since 9 Jul 2025 and 16 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.