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 to13 Jul 2025 That day's board

The worst cities in Chile for PM2.5 over the 30 days to 13 Jul 2025: Nacimiento 88.2 µg/m³, Coyhaique 87.1 µg/m³ and Osorno 86.3 µg/m³.

  1. 1NacimientoBiobio88.2
  2. 2CoyhaiqueAysén87.1
  3. 3OsornoLos Lagos Region86.3
  4. 4LinaresMaule Region83.1
  5. 5VillarricaAraucania71.4
  6. 6Puerto VarasLos Lagos Region70.2
  7. 7HualpénBiobio69.3
  8. 8CuricóMaule Region66.8
  9. 9TemucoAraucania65.3
  10. 10ValdiviaLos Ríos Region64.9
  11. 11LajaBiobio64.7
  12. 12San CarlosÑuble61.5
  13. 13TalaganteSantiago Metropolitan60.2
  14. 14CuranilahueBiobio58.9
  15. 15RancaguaO'Higgins Region56.9
  16. 16HualquiBiobio56.0
  17. 17Los ÁngelesBiobio55.6
  18. 18ChillánÑuble55.4
  19. 19RengoO'Higgins Region55.2
  20. 20Puerto AysénAysén54.8

+ 27 more cities, 54.6 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.