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 10 Apr 2025: Cholula 40.7 µg/m³, Toluca 40.1 µg/m³ and Victoria de Durango 39.7 µg/m³.
- 1CholulaPuebla40.7
- 2TolucaMéxico40.1
- 3Victoria de DurangoDurango39.7
- 4San Antonio la IslaMéxico36.6
- 5San Salvador TizatlalliMéxico36.6
- 6TlaquepaqueJalisco34.2
- 7XonacatlánMéxico31.9
- 8GuadalajaraJalisco31.0
- 9Ciudad JuárezChihuahua30.4
- 10Hacienda Santa FeJalisco30.3
- 11San Luis de la PazGuanajuato28.9
- 12Ciudad NezahualcoyotlMéxico28.1
- 13Cadereyta JiménezNuevo León27.5
- 14IrapuatoGuanajuato25.6
- 15Ciudad Benito JuárezNuevo León25.4
- 16ApizacoTlaxcala24.1
- 17Mixquiahuala de JuárezHidalgo23.3
- 18Atotonilco de TulaHidalgo22.7
- 19TehuacánPuebla22.6
- 20MonterreyNuevo León22.5
+ 28 more cities, 22.3 µg/m³ and below
Not counted on this day, too few days measured: Tlaxcoapan since 10 Apr 2025, Silao de la Victoria since 26 Feb 2025 and Nogales since 16 Feb 2025.
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.