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 to9 Oct 2026 That day's board

The worst cities in Chile for PM2.5 over the 30 days to 9 Oct 2026: Coyhaique 43.3 µg/m³, Hualpén 36.4 µg/m³ and Puerto Varas 36.3 µg/m³.

  1. 1CoyhaiqueAysén43.3
  2. 2HualpénBiobio36.4
  3. 3Puerto VarasLos Lagos Region36.3
  4. 4OsornoLos Lagos Region34.8
  5. 5VillarricaAraucania30.4
  6. 6ValdiviaLos Ríos Region30.2
  7. 7CuranilahueBiobio30.2
  8. 8La UniónLos Ríos Region29.9
  9. 9Puerto AysénAysén28.8
  10. 10NacimientoBiobio28.8
  11. 11Puerto MonttLos Lagos Region27.7
  12. 12ChillánÑuble25.5
  13. 13Puente AltoSantiago Metropolitan25.4
  14. 14SantiagoSantiago Metropolitan25.1
  15. 15RancaguaO'Higgins Region24.8
  16. 16San CarlosÑuble24.6
  17. 17LinaresMaule Region23.7
  18. 18HualquiBiobio23.7
  19. 19TemucoAraucania23.6
  20. 20CuricóMaule Region22.7

+ 26 more cities, 22.3 µg/m³ and below

Not counted on this day, too few days measured: Laja since 8 Oct 2026 and Quilpué since 21 Sep 2026.

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.