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 Oct 2025 That day's board

The worst cities in Chile for PM2.5 over the 30 days to 13 Oct 2025: Coyhaique 40.1 µg/m³, Puerto Varas 40.0 µg/m³ and Nacimiento 34.7 µg/m³.

  1. 1CoyhaiqueAysén40.1
  2. 2Puerto VarasLos Lagos Region40.0
  3. 3NacimientoBiobio34.7
  4. 4OsornoLos Lagos Region33.5
  5. 5VillarricaAraucania31.0
  6. 6Puerto MonttLos Lagos Region28.4
  7. 7Puente AltoSantiago Metropolitan25.7
  8. 8ValdiviaLos Ríos Region25.0
  9. 9ConcónValparaiso24.4
  10. 10TocopillaAntofagasta24.3
  11. 11SantiagoSantiago Metropolitan24.3
  12. 12CuricóMaule Region24.2
  13. 13CuranilahueBiobio23.1
  14. 14LajaBiobio22.9
  15. 15TalaganteSantiago Metropolitan22.8
  16. 16Puerto AysénAysén22.8
  17. 17RancaguaO'Higgins Region22.7
  18. 18HualpénBiobio22.5
  19. 19PuchuncavíValparaiso22.3
  20. 20CopiapóAtacama22.3

+ 26 more cities, 22.2 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.