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 9 Jul 2025: Cholula 32.7 µg/m³, Mexicali 20.1 µg/m³ and Tepeji del Río de Ocampo 19.2 µg/m³.
- 1CholulaPuebla32.7
- 2MexicaliBaja California20.1
- 3Tepeji del Río de OcampoHidalgo19.2
- 4Atotonilco de TulaHidalgo18.7
- 5GarcíaNuevo León18.1
- 6Victoria de DurangoDurango17.9
- 7ApizacoTlaxcala15.8
- 8TijuanaBaja California15.6
- 9Santa CatarinaNuevo León14.7
- 10Ciudad Benito JuárezNuevo León14.5
- 11TlaquepaqueJalisco14.3
- 12Ciudad JuárezChihuahua13.9
- 13AguascalientesAguascalientes13.7
- 14SaltilloCoahuila13.4
- 15La Providencia Siglo XXIHidalgo13.4
- 16MonterreyNuevo León13.1
- 17PueblaPuebla11.9
- 18San Martin Texmelucan de LabastidaPuebla11.7
- 19Mexico CityMexico City11.5
- 20Mixquiahuala de JuárezHidalgo11.1
+ 13 more cities, 10.6 µg/m³ and below
Not counted on this day, too few days measured: Atlixco since 9 Jul 2025, Naucalpan de Juárez since 7 Jul 2025, Santa Anita since 7 Jul 2025 and 19 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.