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 Oct 2025 That day's board

The worst cities in Chile for PM2.5 over the 30 days to 14 Oct 2025: Coyhaique 40.1 µg/m³, Puerto Varas 36.0 µg/m³ and Nacimiento 33.6 µg/m³.

  1. 1CoyhaiqueAysén40.1
  2. 2Puerto VarasLos Lagos Region36.0
  3. 3NacimientoBiobio33.6
  4. 4OsornoLos Lagos Region32.9
  5. 5VillarricaAraucania30.8
  6. 6Puerto MonttLos Lagos Region28.3
  7. 7Puente AltoSantiago Metropolitan25.6
  8. 8ValdiviaLos Ríos Region24.6
  9. 9SantiagoSantiago Metropolitan24.3
  10. 10CuricóMaule Region24.3
  11. 11ConcónValparaiso24.1
  12. 12TocopillaAntofagasta23.7
  13. 13TalaganteSantiago Metropolitan22.8
  14. 14RancaguaO'Higgins Region22.8
  15. 15Puerto AysénAysén22.6
  16. 16LajaBiobio22.6
  17. 17CuranilahueBiobio22.4
  18. 18CopiapóAtacama22.3
  19. 19AricaArica y Parinacota Region22.2
  20. 20PuchuncavíValparaiso22.1

+ 26 more cities, 21.8 µg/m³ and below

Not counted on this day, too few days measured: La Unión since 20 Sep 2025.

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.