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 Jan 2026 That day's board

The worst cities in Chile for PM2.5 over the 30 days to 9 Jan 2026: Arica 30.8 µg/m³, Puente Alto 24.7 µg/m³ and Hualpén 24.2 µg/m³.

  1. 1AricaArica y Parinacota Region30.8
  2. 2Puente AltoSantiago Metropolitan24.7
  3. 3HualpénBiobio24.2
  4. 4CopiapóAtacama22.4
  5. 5SantiagoSantiago Metropolitan21.9
  6. 6TocopillaAntofagasta20.5
  7. 7PuchuncavíValparaiso19.5
  8. 8CuricóMaule Region19.2
  9. 9CoronelBiobio19.2
  10. 10ConcónValparaiso19.2
  11. 11RancaguaO'Higgins Region19.1
  12. 12QuinteroValparaiso19.1
  13. 13QuilpuéValparaiso19.0
  14. 14TalaganteSantiago Metropolitan18.8
  15. 15Viña del MarValparaiso18.7
  16. 16AntofagastaAntofagasta18.3
  17. 17Puerto VarasLos Lagos Region18.2
  18. 18QuillotaValparaiso17.8
  19. 19NacimientoBiobio17.4
  20. 20Alto HospicioTarapacá17.4

+ 23 more cities, 17.1 µg/m³ and below

Not counted on this day, too few days measured: Curanilahue since 31 Dec 2025 and Lota since 20 Dec 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.