SmogRank / History / City race

Cities in Chile, 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.

CountriesCities
The 30 days to14 Sep 2025 That day's board

The worst cities in Chile for PM2.5 over the 30 days to 14 Sep 2025: Coyhaique 57.1 µg/m³, Nacimiento 56.8 µg/m³ and Puerto Varas 55.8 µg/m³.

  1. 1CoyhaiqueAysén57.1
  2. 2NacimientoBiobio56.8
  3. 3Puerto VarasLos Lagos Region55.8
  4. 4OsornoLos Lagos Region51.9
  5. 5ValdiviaLos Ríos Region40.3
  6. 6HualpénBiobio39.6
  7. 7VillarricaAraucania39.5
  8. 8La UniónLos Ríos Region38.8
  9. 9LajaBiobio36.5
  10. 10CuranilahueBiobio35.4
  11. 11Puerto MonttLos Lagos Region34.7
  12. 12Puerto AysénAysén34.5
  13. 13CuricóMaule Region34.2
  14. 14RengoO'Higgins Region33.8
  15. 15Los ÁngelesBiobio33.1
  16. 16San CarlosÑuble32.5
  17. 17HualquiBiobio32.5
  18. 18RancaguaO'Higgins Region32.1
  19. 19TemucoAraucania31.3
  20. 20Puente AltoSantiago Metropolitan30.8

+ 27 more cities, 30.1 µg/m³ and below

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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.