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 to8 Sep 2026 That day's board

The worst cities in Chile for PM2.5 over the 30 days to 8 Sep 2026: Coyhaique 102.1 µg/m³, Osorno 65.5 µg/m³ and Puerto Varas 62.3 µg/m³.

  1. 1CoyhaiqueAysén102.1
  2. 2OsornoLos Lagos Region65.5
  3. 3Puerto VarasLos Lagos Region62.3
  4. 4NacimientoBiobio53.8
  5. 5ValdiviaLos Ríos Region52.5
  6. 6HualpénBiobio50.7
  7. 7LinaresMaule Region49.0
  8. 8LajaBiobio48.2
  9. 9CuranilahueBiobio45.4
  10. 10Puerto MonttLos Lagos Region44.4
  11. 11La UniónLos Ríos Region44.4
  12. 12ChillánÑuble43.0
  13. 13CuricóMaule Region42.7
  14. 14San CarlosÑuble39.4
  15. 15HualquiBiobio38.4
  16. 16TemucoAraucania38.2
  17. 17VillarricaAraucania38.1
  18. 18TalcaMaule Region36.1
  19. 19Puerto AysénAysén35.3
  20. 20RancaguaO'Higgins Region33.1

+ 27 more cities, 32.1 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.