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 8 Jul 2026: Tuxtla 22.8 µg/m³, Aguascalientes 22.5 µg/m³ and Hacienda Santa Fe 22.0 µg/m³.
- 1TuxtlaChiapas22.8
- 2AguascalientesAguascalientes22.5
- 3Hacienda Santa FeJalisco22.0
- 4Naucalpan de JuárezMéxico20.8
- 5Ciudad NezahualcoyotlMéxico19.9
- 6MexicaliBaja California19.7
- 7TijuanaBaja California17.0
- 8PueblaPuebla16.6
- 9Mexico CityMexico City16.6
- 10Santa CatarinaNuevo León16.1
- 11TlaquepaqueJalisco16.0
- 12Atotonilco de TulaHidalgo15.8
- 13Ciudad General EscobedoNuevo León15.1
- 14GuadalajaraJalisco14.4
- 15SalamancaGuanajuato14.1
- 16IrapuatoGuanajuato13.8
- 17León de los AldamaGuanajuato13.4
- 18San MarcosHidalgo13.2
- 19Ciudad ApodacaNuevo León13.2
- 20ZapopanJalisco12.7
+ 25 more cities, 12.6 µg/m³ and below
Not counted on this day, too few days measured: Morelia since 4 Jul 2026, Santa Anita since 27 Jun 2026, San Luis Potosí since 21 Jun 2026 and 8 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.