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 5 Jan 2026: Tlaquepaque 83.6 µg/m³, Aguascalientes 54.4 µg/m³ and Hacienda Santa Fe 52.2 µg/m³.
- 1TlaquepaqueJalisco83.6
- 2AguascalientesAguascalientes54.4
- 3Hacienda Santa FeJalisco52.2
- 4TijuanaBaja California47.5
- 5GuadalajaraJalisco43.3
- 6XonacatlánMéxico38.9
- 7Ciudad Benito JuárezNuevo León38.6
- 8MexicaliBaja California35.0
- 9Ciudad NezahualcoyotlMéxico34.0
- 10San Antonio la IslaMéxico32.7
- 11San Salvador TizatlalliMéxico32.7
- 12San Luis PotosíSan Luis Potosí29.9
- 13Zacatepec de HidalgoMorelos28.6
- 14IrapuatoGuanajuato28.0
- 15Santa AnitaJalisco27.4
- 16PueblaPuebla24.8
- 17Mexico CityMexico City24.5
- 18Silao de la VictoriaGuanajuato24.0
- 19CuernavacaMorelos23.2
- 20Naucalpan de JuárezMéxico23.1
+ 30 more cities, 22.8 µg/m³ and below
Not counted on this day, too few days measured: Apizaco since 2 Jan 2026, Saltillo since 1 Jan 2026, Yecapixtla since 31 Dec 2025 and 6 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.