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 21 Jun 2024: Celaya 25.7 µg/m³, Irapuato 24.9 µg/m³ and San Luis de la Paz 24.0 µg/m³.
- 1CelayaGuanajuato25.7
- 2IrapuatoGuanajuato24.9
- 3San Luis de la PazGuanajuato24.0
- 4San Miguel de AllendeGuanajuato23.4
- 5San Juan del RíoQuerétaro20.7
- 6Heroica MatamorosTamaulipas18.4
- 7AbasoloGuanajuato17.8
- 8SalamancaGuanajuato17.1
- 9NogalesSonora9.6
Not counted on this day, too few days measured: León de los Aldama since 21 Jun 2024, Silao de la Victoria since 20 Jun 2024, Guanajuato since 19 Jun 2024 and 2 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.