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 12 Jan 2026: Tlaquepaque 76.2 µg/m³, Aguascalientes 56.0 µg/m³ and Hacienda Santa Fe 51.7 µg/m³.
- 1TlaquepaqueJalisco76.2
- 2AguascalientesAguascalientes56.0
- 3Hacienda Santa FeJalisco51.7
- 4GuadalajaraJalisco43.8
- 5TijuanaBaja California42.1
- 6XonacatlánMéxico39.1
- 7Ciudad Benito JuárezNuevo León38.7
- 8Ciudad NezahualcoyotlMéxico36.3
- 9San Luis PotosíSan Luis Potosí30.3
- 10IrapuatoGuanajuato29.0
- 11Zacatepec de HidalgoMorelos28.6
- 12MexicaliBaja California27.4
- 13Santa AnitaJalisco27.2
- 14Mexico CityMexico City25.6
- 15PueblaPuebla25.5
- 16Silao de la VictoriaGuanajuato24.8
- 17CuernavacaMorelos23.9
- 18Naucalpan de JuárezMéxico23.7
- 19Cadereyta JiménezNuevo León23.6
- 20Mixquiahuala de JuárezHidalgo23.3
+ 25 more cities, 23.0 µg/m³ and below
Not counted on this day, too few days measured: San Antonio la Isla since 10 Jan 2026, Tepic since 10 Jan 2026, Salamanca since 10 Jan 2026 and 11 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.