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 13 Nov 2025: Cholula 40.1 µg/m³, Hacienda Santa Fe 33.4 µg/m³ and Tijuana 30.6 µg/m³.
- 1CholulaPuebla40.1
- 2Hacienda Santa FeJalisco33.4
- 3TijuanaBaja California30.6
- 4XonacatlánMéxico30.3
- 5San Antonio la IslaMéxico29.7
- 6San Salvador TizatlalliMéxico29.7
- 7GuadalajaraJalisco29.6
- 8San Francisco TlalcilalcalpanMéxico29.5
- 9Santiaguito TlalcilalcalliMéxico29.5
- 10TlaquepaqueJalisco28.3
- 11Ciudad Benito JuárezNuevo León25.2
- 12Ciudad General EscobedoNuevo León23.0
- 13SalamancaGuanajuato22.9
- 14TuxtlaChiapas22.8
- 15GarcíaNuevo León22.4
- 16MexicaliBaja California21.6
- 17Santa CatarinaNuevo León21.0
- 18Santa AnitaJalisco20.5
- 19NogalesSonora19.6
- 20Mexico CityMexico City18.7
+ 29 more cities, 18.6 µg/m³ and below
Not counted on this day, too few days measured: San Luis de la Paz since 12 Nov 2025, Irapuato since 5 Nov 2025, San Miguel de Allende since 1 Nov 2025 and 3 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.