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 20 Jan 2024: Ciudad Benito Juárez 50.4 µg/m³, Tijuana 36.5 µg/m³ and Cholula 35.4 µg/m³.
- 1Ciudad Benito JuárezNuevo León50.4
- 2TijuanaBaja California36.5
- 3CholulaPuebla35.4
- 4GuadalajaraJalisco32.5
- 5MexicaliBaja California32.1
- 6Ciudad ApodacaNuevo León30.5
- 7CelayaGuanajuato29.0
- 8Ciudad General EscobedoNuevo León28.3
- 9Santa CatarinaNuevo León28.0
- 10TolucaMéxico27.8
- 11VeracruzVeracruz25.7
- 12MonterreyNuevo León25.4
- 13Cadereyta JiménezNuevo León25.3
- 14Zacatepec de HidalgoMorelos25.2
- 15San Antonio la IslaMéxico24.5
- 16San Salvador TizatlalliMéxico24.5
- 17Silao de la VictoriaGuanajuato23.8
- 18San Martin Texmelucan de LabastidaPuebla21.9
- 19SalamancaGuanajuato21.3
- 20IrapuatoGuanajuato21.3
+ 17 more cities, 21.1 µg/m³ and below
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 readers for them. Most cities there are missing from this board, not clean. Why.