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 4 Jun 2026: Tuxtla 37.5 µg/m³, Hacienda Santa Fe 31.0 µg/m³ and San Luis Potosí 30.5 µg/m³.
- 1TuxtlaChiapas37.5
- 2Hacienda Santa FeJalisco31.0
- 3San Luis PotosíSan Luis Potosí30.5
- 4AguascalientesAguascalientes29.2
- 5TlaquepaqueJalisco26.5
- 6PueblaPuebla25.6
- 7Pachuca de SotoHidalgo24.7
- 8Ciudad NezahualcoyotlMéxico24.5
- 9Atotonilco de TulaHidalgo23.9
- 10MoreliaMichoacán23.0
- 11Mexico CityMexico City21.8
- 12Mixquiahuala de JuárezHidalgo21.6
- 13SaltilloCoahuila19.7
- 14TepicNayarit19.3
- 15GuadalajaraJalisco19.2
- 16MexicaliBaja California19.1
- 17Santiago de QuerétaroQuerétaro18.7
- 18León de los AldamaGuanajuato18.7
- 19ZapopanJalisco18.5
- 20YecapixtlaMorelos18.3
+ 23 more cities, 18.3 µg/m³ and below
Not counted on this day, too few days measured: Salamanca since 3 Jun 2026, Celaya since 3 Jun 2026, Naucalpan de Juárez since 1 Jun 2026 and 13 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.