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 Feb 2026: Hacienda Santa Fe 36.5 µg/m³, Tlaquepaque 35.2 µg/m³ and Tijuana 34.4 µg/m³.
- 1Hacienda Santa FeJalisco36.5
- 2TlaquepaqueJalisco35.2
- 3TijuanaBaja California34.4
- 4XonacatlánMéxico32.8
- 5AguascalientesAguascalientes32.1
- 6San Luis PotosíSan Luis Potosí27.5
- 7GuadalajaraJalisco27.1
- 8MexicaliBaja California26.3
- 9Naucalpan de JuárezMéxico24.0
- 10Zacatepec de HidalgoMorelos23.8
- 11Mexico CityMexico City23.5
- 12Santa AnitaJalisco21.2
- 13San Martin Texmelucan de LabastidaPuebla19.9
- 14PueblaPuebla19.5
- 15Silao de la VictoriaGuanajuato18.9
- 16San MarcosHidalgo18.8
- 17ApizacoTlaxcala17.8
- 18La Providencia Siglo XXIHidalgo17.5
- 19CuernavacaMorelos16.4
- 20ZapopanJalisco16.4
+ 22 more cities, 16.3 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 15 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.