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 Oct 2023: Mexicali 26.8 µg/m³, Tijuana 24.3 µg/m³ and San Francisco Tlalcilalcalpan 22.6 µg/m³.
- 1MexicaliBaja California26.8
- 2TijuanaBaja California24.3
- 3San Francisco TlalcilalcalpanMéxico22.6
- 4Santiaguito TlalcilalcalliMéxico22.6
- 5TolucaMéxico21.8
- 6San Antonio la IslaMéxico21.6
- 7San Salvador TizatlalliMéxico21.6
- 8CholulaPuebla18.5
- 9GuadalajaraJalisco18.5
- 10Atotonilco de TulaHidalgo18.2
- 11SalamancaGuanajuato17.9
- 12Santa CatarinaNuevo León17.5
- 13CuernavacaMorelos17.4
- 14Ciudad ApodacaNuevo León17.4
- 15SaltilloCoahuila15.8
- 16MoreliaMichoacán15.4
- 17Ciudad Benito JuárezNuevo León15.1
- 18CelayaGuanajuato14.0
- 19PueblaPuebla13.8
- 20Ciudad JuárezChihuahua13.7
+ 15 more cities, 13.4 µg/m³ and below
Not counted on this day, too few days measured: Cadereyta Jiménez since 18 Oct 2023, Tlaquepaque since 17 Oct 2023, San Miguel de Allende since 17 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 readers for them. Most cities there are missing from this board, not clean. Why.