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 11 Feb 2026: Hacienda Santa Fe 36.6 µg/m³, Tijuana 34.2 µg/m³ and Tlaquepaque 34.0 µg/m³.
- 1Hacienda Santa FeJalisco36.6
- 2TijuanaBaja California34.2
- 3TlaquepaqueJalisco34.0
- 4XonacatlánMéxico33.0
- 5AguascalientesAguascalientes32.5
- 6San Luis PotosíSan Luis Potosí27.6
- 7MexicaliBaja California27.2
- 8GuadalajaraJalisco27.1
- 9Zacatepec de HidalgoMorelos26.5
- 10Naucalpan de JuárezMéxico24.0
- 11Mexico CityMexico City24.0
- 12San Martin Texmelucan de LabastidaPuebla21.1
- 13Santa AnitaJalisco20.9
- 14PueblaPuebla20.0
- 15Silao de la VictoriaGuanajuato19.6
- 16San MarcosHidalgo19.2
- 17ApizacoTlaxcala18.2
- 18La Providencia Siglo XXIHidalgo18.2
- 19Santa CatarinaNuevo León17.8
- 20CuernavacaMorelos16.7
+ 23 more cities, 16.5 µg/m³ and below
Not counted on this day, too few days measured: Parque Industrial Ciudad Mitras since 4 Feb 2026, Guanajuato since 1 Feb 2026, Irapuato since 31 Jan 2026 and 13 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.