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 Dec 2025: Aguascalientes 44.2 µg/m³, Tlaquepaque 39.7 µg/m³ and Hacienda Santa Fe 38.9 µg/m³.
- 1AguascalientesAguascalientes44.2
- 2TlaquepaqueJalisco39.7
- 3Hacienda Santa FeJalisco38.9
- 4TijuanaBaja California37.2
- 5XonacatlánMéxico35.6
- 6San Antonio la IslaMéxico34.2
- 7San Salvador TizatlalliMéxico34.2
- 8GuadalajaraJalisco32.9
- 9San Francisco TlalcilalcalpanMéxico32.3
- 10Santiaguito TlalcilalcalliMéxico32.3
- 11MexicaliBaja California31.2
- 12Ciudad NezahualcoyotlMéxico30.7
- 13Ciudad Benito JuárezNuevo León29.8
- 14Zacatepec de HidalgoMorelos29.3
- 15Santa CatarinaNuevo León27.7
- 16PueblaPuebla25.3
- 17IrapuatoGuanajuato24.6
- 18Naucalpan de JuárezMéxico24.0
- 19Mixquiahuala de JuárezHidalgo23.3
- 20TuxtlaChiapas22.9
+ 25 more cities, 22.7 µg/m³ and below
Not counted on this day, too few days measured: Atlixco since 13 Dec 2025, Abasolo since 10 Dec 2025, García since 2 Dec 2025 and 9 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.