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 19 Feb 2024: Celaya 22.5 µg/m³, Irapuato 17.2 µg/m³ and Silao de la Victoria 16.5 µg/m³.
- 1CelayaGuanajuato22.5
- 2IrapuatoGuanajuato17.2
- 3Silao de la VictoriaGuanajuato16.5
- 4SalamancaGuanajuato16.1
- 5León de los AldamaGuanajuato15.7
- 6San Luis de la PazGuanajuato12.4
- 7NogalesSonora12.1
- 8AbasoloGuanajuato11.4
- 9GuanajuatoGuanajuato10.9
- 10San Miguel de AllendeGuanajuato10.2
- 11Ciudad JuárezChihuahua8.4
Not counted on this day, too few days measured: Zacatepec de Hidalgo since 25 Jan 2024, Tehuacán since 25 Jan 2024, San Martin Texmelucan de Labastida since 25 Jan 2024 and 34 more cities. Days missing from the source archive fall in this window, so fewer countries are counted.
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.