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 Jun 2025: Cholula 30.7 µg/m³, Victoria de Durango 27.9 µg/m³ and Hacienda Santa Fe 27.5 µg/m³.
- 1CholulaPuebla30.7
- 2Victoria de DurangoDurango27.9
- 3Hacienda Santa FeJalisco27.5
- 4TlaquepaqueJalisco25.4
- 5Atotonilco de TulaHidalgo24.8
- 6Naucalpan de JuárezMéxico24.1
- 7Tepeji del Río de OcampoHidalgo23.2
- 8Ciudad Benito JuárezNuevo León23.1
- 9ApizacoTlaxcala22.2
- 10MonterreyNuevo León21.3
- 11Santa CatarinaNuevo León20.9
- 12AguascalientesAguascalientes20.9
- 13TlaxcoapanHidalgo20.1
- 14Ciudad NezahualcoyotlMéxico19.6
- 15SaltilloCoahuila19.3
- 16Mixquiahuala de JuárezHidalgo19.2
- 17Ciudad JuárezChihuahua19.2
- 18MéridaYucatán19.0
- 19GuadalajaraJalisco18.7
- 20Mexico CityMexico City18.5
+ 25 more cities, 18.4 µg/m³ and below
Not counted on this day, too few days measured: Cadereyta Jiménez since 11 Jun 2025, León de los Aldama since 11 Jun 2025, Salamanca since 8 Jun 2025 and 9 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.