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 23 Aug 2023: Morelia 111.0 µg/m³, Mexicali 34.0 µg/m³ and Xonacatlán 25.7 µg/m³.
- 1MoreliaMichoacán111.0
- 2MexicaliBaja California34.0
- 3XonacatlánMéxico25.7
- 4San Francisco TlalcilalcalpanMéxico23.0
- 5Santiaguito TlalcilalcalliMéxico23.0
- 6Ciudad ApodacaNuevo León22.3
- 7TolucaMéxico21.1
- 8Ciudad JuárezChihuahua20.9
- 9San Antonio la IslaMéxico18.6
- 10San Salvador TizatlalliMéxico18.6
- 11Santa CatarinaNuevo León18.4
- 12Ciudad Benito JuárezNuevo León17.5
- 13Victoria de DurangoDurango17.5
- 14CelayaGuanajuato16.4
- 15Naucalpan de JuárezMéxico16.3
- 16Atotonilco de TulaHidalgo16.2
- 17Tepeji del Río de OcampoHidalgo15.6
- 18MonterreyNuevo León15.3
- 19HuichapanHidalgo15.2
- 20Jardines de la SillaNuevo León14.8
+ 17 more cities, 13.8 µg/m³ and below
Not counted on this day, too few days measured: San Juan del Río since 20 Aug 2023, Salamanca since 20 Aug 2023, García since 18 Aug 2023 and 3 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.