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 8 Jun 2026: Tuxtla 35.1 µg/m³, Hacienda Santa Fe 31.5 µg/m³ and San Luis Potosí 28.5 µg/m³.
- 1TuxtlaChiapas35.1
- 2Hacienda Santa FeJalisco31.5
- 3San Luis PotosíSan Luis Potosí28.5
- 4AguascalientesAguascalientes26.7
- 5PueblaPuebla23.7
- 6Pachuca de SotoHidalgo23.7
- 7TlaquepaqueJalisco23.7
- 8Ciudad NezahualcoyotlMéxico23.6
- 9Atotonilco de TulaHidalgo22.5
- 10Mexico CityMexico City21.1
- 11MoreliaMichoacán20.5
- 12Mixquiahuala de JuárezHidalgo20.0
- 13MexicaliBaja California19.7
- 14TepicNayarit18.0
- 15YecapixtlaMorelos17.7
- 16Tetela del VolcánMorelos17.7
- 17SaltilloCoahuila17.4
- 18San MarcosHidalgo16.8
- 19GuadalajaraJalisco16.8
- 20ZapopanJalisco16.7
+ 20 more cities, 16.6 µg/m³ and below
Not counted on this day, too few days measured: Parque Industrial Ciudad Mitras since 8 Jun 2026, León de los Aldama since 6 Jun 2026, Victoria de Durango since 5 Jun 2026 and 16 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.