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 11 Jun 2026: Tuxtla 34.1 µg/m³, Hacienda Santa Fe 30.0 µg/m³ and San Luis Potosí 27.0 µg/m³.
- 1TuxtlaChiapas34.1
- 2Hacienda Santa FeJalisco30.0
- 3San Luis PotosíSan Luis Potosí27.0
- 4AguascalientesAguascalientes26.1
- 5Naucalpan de JuárezMéxico24.6
- 6TlaquepaqueJalisco23.0
- 7Ciudad NezahualcoyotlMéxico22.5
- 8PueblaPuebla22.4
- 9Pachuca de SotoHidalgo22.1
- 10Atotonilco de TulaHidalgo21.6
- 11Mexico CityMexico City20.2
- 12MoreliaMichoacán19.3
- 13MexicaliBaja California19.0
- 14Mixquiahuala de JuárezHidalgo18.6
- 15YecapixtlaMorelos17.8
- 16Tetela del VolcánMorelos17.8
- 17TepicNayarit17.3
- 18SaltilloCoahuila16.8
- 19San MarcosHidalgo16.3
- 20ZapopanJalisco15.9
+ 22 more cities, 15.9 µg/m³ and below
Not counted on this day, too few days measured: León de los Aldama since 6 Jun 2026, Victoria de Durango since 5 Jun 2026, Salamanca since 3 Jun 2026 and 14 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.