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 Nov 2023: Morelia 49.6 µg/m³, Victoria de Durango 30.3 µg/m³ and Guadalajara 29.3 µg/m³.
- 1MoreliaMichoacán49.6
- 2Victoria de DurangoDurango30.3
- 3GuadalajaraJalisco29.3
- 4MexicaliBaja California27.8
- 5TolucaMéxico27.1
- 6TijuanaBaja California27.1
- 7CholulaPuebla26.3
- 8San Francisco TlalcilalcalpanMéxico26.0
- 9Santiaguito TlalcilalcalliMéxico26.0
- 10Ciudad Benito JuárezNuevo León26.0
- 11San Antonio la IslaMéxico24.6
- 12San Salvador TizatlalliMéxico24.6
- 13SalamancaGuanajuato22.1
- 14Santa CatarinaNuevo León21.0
- 15CelayaGuanajuato18.5
- 16MonterreyNuevo León17.7
- 17Ciudad General EscobedoNuevo León17.0
- 18Ciudad JuárezChihuahua15.0
- 19SaltilloCoahuila14.8
- 20Tepeji del Río de OcampoHidalgo14.7
+ 17 more cities, the next at 14.5 µg/m³
Not counted on this day, too few days measured: Silao de la Victoria since 18 Nov 2023, San Andrés Tuxtla since 24 Oct 2023, Atotonilco de Tula since 23 Oct 2023 and 10 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.