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 23 Jan 2024: Ciudad Benito Juárez 52.0 µg/m³, Tijuana 37.5 µg/m³ and Cholula 34.7 µg/m³.
- 1Ciudad Benito JuárezNuevo León52.0
- 2TijuanaBaja California37.5
- 3CholulaPuebla34.7
- 4MexicaliBaja California32.9
- 5GuadalajaraJalisco32.4
- 6Ciudad ApodacaNuevo León31.4
- 7CelayaGuanajuato28.9
- 8Ciudad General EscobedoNuevo León28.3
- 9TolucaMéxico26.8
- 10Santa CatarinaNuevo León26.6
- 11Cadereyta JiménezNuevo León25.8
- 12MonterreyNuevo León25.1
- 13Silao de la VictoriaGuanajuato23.4
- 14Zacatepec de HidalgoMorelos22.7
- 15VeracruzVeracruz22.7
- 16San Antonio la IslaMéxico22.6
- 17San Salvador TizatlalliMéxico22.6
- 18San Andrés TuxtlaVeracruz21.5
- 19SalamancaGuanajuato21.4
- 20IrapuatoGuanajuato21.0
+ 17 more cities, the next at 20.3 µg/m³
Not counted on this day, too few days measured: Tepeji del Río de Ocampo since 20 Jan 2024, Tlaxcoapan since 18 Jan 2024, San Francisco Tlalcilalcalpan since 18 Jan 2024 and 11 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.