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 24 Jun 2023: Celaya 29.6 µg/m³, Salamanca 28.1 µg/m³ and León de los Aldama 21.5 µg/m³.
- 1CelayaGuanajuato29.6
- 2SalamancaGuanajuato28.1
- 3León de los AldamaGuanajuato21.5
- 4Ecatepec de MorelosMéxico20.6
- 5Mexico CityMexico City19.7
- 6San Luis de la PazGuanajuato18.9
- 7GuanajuatoGuanajuato18.3
- 8Ciudad JuárezChihuahua16.9
- 9San Miguel de AllendeGuanajuato16.8
- 10AbasoloGuanajuato16.2
- 11NogalesSonora7.8
Not counted on this day, too few days measured: Silao de la Victoria since 15 Jun 2023, Irapuato since 13 Jun 2023, Tijuana since 31 May 2023 and 31 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.