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 10 Dec 2025: Hacienda Santa Fe 41.0 µg/m³, Aguascalientes 39.7 µg/m³ and Xonacatlán 35.8 µg/m³.
- 1Hacienda Santa FeJalisco41.0
- 2AguascalientesAguascalientes39.7
- 3XonacatlánMéxico35.8
- 4TlaquepaqueJalisco35.8
- 5TijuanaBaja California34.9
- 6San Antonio la IslaMéxico33.2
- 7San Salvador TizatlalliMéxico33.2
- 8GuadalajaraJalisco32.4
- 9San Francisco TlalcilalcalpanMéxico31.7
- 10Santiaguito TlalcilalcalliMéxico31.7
- 11Ciudad NezahualcoyotlMéxico30.1
- 12MexicaliBaja California28.9
- 13AtlixcoPuebla28.4
- 14Santa CatarinaNuevo León27.9
- 15Ciudad Benito JuárezNuevo León27.8
- 16Zacatepec de HidalgoMorelos27.2
- 17PueblaPuebla24.4
- 18Naucalpan de JuárezMéxico24.2
- 19Mexico CityMexico City23.0
- 20TuxtlaChiapas22.5
+ 21 more cities, 22.4 µg/m³ and below
Not counted on this day, too few days measured: Salamanca since 10 Dec 2025, León de los Aldama since 10 Dec 2025, Irapuato since 10 Dec 2025 and 12 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.