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 16 Feb 2025: Silao de la Victoria 26.0 µg/m³, Irapuato 24.6 µg/m³ and Mexico City 21.7 µg/m³.
- 1Silao de la VictoriaGuanajuato26.0
- 2IrapuatoGuanajuato24.6
- 3Mexico CityMexico City21.7
- 4San Luis de la PazGuanajuato20.3
- 5CelayaGuanajuato18.3
- 6AbasoloGuanajuato16.4
- 7SalamancaGuanajuato16.3
- 8TijuanaBaja California15.8
- 9GuanajuatoGuanajuato13.8
- 10San Miguel de AllendeGuanajuato13.7
- 11Heroica MatamorosTamaulipas8.7
Not counted on this day, too few days measured: Nogales since 16 Feb 2025, Xonacatlán since 14 Feb 2025, Ciudad Nezahualcoyotl since 10 Feb 2025 and 3 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.