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 18 Nov 2024: Silao de la Victoria 23.7 µg/m³, Ciudad Nezahualcoyotl 22.8 µg/m³ and León de los Aldama 20.9 µg/m³.
- 1Silao de la VictoriaGuanajuato23.7
- 2Ciudad NezahualcoyotlMéxico22.8
- 3León de los AldamaGuanajuato20.9
- 4IrapuatoGuanajuato20.8
- 5Mexico CityMexico City19.6
- 6San Luis de la PazGuanajuato18.0
- 7CelayaGuanajuato16.4
- 8SalamancaGuanajuato15.5
- 9NogalesSonora15.4
- 10AbasoloGuanajuato14.9
- 11San Miguel de AllendeGuanajuato14.2
- 12GuanajuatoGuanajuato13.6
- 13Heroica MatamorosTamaulipas6.4
Not counted on this day, too few days measured: Aguascalientes since 26 Sep 2024.
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.