SmogRank / World / Chile / October 2025

Most polluted cities in Chile, October 2025

38 cities in Chile ranked by their average PM2.5 over the 31 days. Worst: Puerto Varas at 32.2 µg/m³, #183 of 2,296 cities in the world. Cleanest: Tomé at 15.0. A city needs measurements on 70% of the days to be ranked.

← Puerto Varas 32.2
Every city in Chile ranked for October 2025, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Puerto VarasLos Lagos Region
    94
  2. 2CoyhaiqueAysén
    89
  3. 3NacimientoBiobio
    86
  4. 4Puerto MonttLos Lagos Region
    84
  5. 5OsornoLos Lagos Region
    83
  6. 6VillarricaAraucania
    83
  7. 7Puente AltoSantiago Metropolitan
    80
  8. 8ConcónValparaiso
    80
  9. 9TocopillaAntofagasta
    77
  10. 10AricaArica y Parinacota Region
    77
  11. 11SantiagoSantiago Metropolitan
    77
  12. 12TalaganteSantiago Metropolitan
    75
  13. 13QuinteroValparaiso
    75
  14. 13HualpénBiobio
    75
  15. 15RancaguaO'Higgins Region
    73
  16. 15CuricóMaule Region
    73
  17. 17Puerto AysénAysén
    73
  18. 18CopiapóAtacama
    73
  19. 19ValdiviaLos Ríos Region
    71
  20. 19CoronelBiobio
    71
  21. 19AntofagastaAntofagasta
    71
  22. 22QuilpuéValparaiso
    70
  23. 23HualquiBiobio
    70
  24. 24Viña del MarValparaiso
    69
  25. 25RengoO'Higgins Region
    69
  26. 26QuillotaValparaiso
    68
  27. 27Los ÁngelesBiobio
    68
  28. 28TemucoAraucania
    68
  29. 29Alto HospicioTarapacá
    67
  30. 30CuranilahueBiobio
    67
  31. 31CoquimboCoquimbo Region
    66
  32. 32TalcaMaule Region
    66
  33. 32CalamaAntofagasta
    66
  34. 34ChiguayanteBiobio
    65
  35. 35San Pedro de la PazBiobio
    64
  36. 36ChillánÑuble
    64
  37. 37TalcahuanoBiobio
    63
  38. 38ToméBiobio
    62
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, October 2025 · Chile now

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SmogRank, most polluted cities in Chile, PM2.5, October 2025, smogrank.com/cl/history/2025-10 (accessed 2 Oct 2026).

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