SmogRank / World / Chile / September 2025

Most polluted cities in Chile, September 2025

44 cities in Chile ranked by their average PM2.5 over the 30 days. Worst: Coyhaique at 49.2 µg/m³, #20 of 2,711 cities in the world. Cleanest: Lota at 15.2. A city needs measurements on 70% of the days to be ranked.

← Coyhaique 49.2 µg/m³ 40 µg/m³0
Every city in Chile ranked for September 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1CoyhaiqueAysén
    135
  2. 2Puerto VarasLos Lagos Region
    128
  3. 3NacimientoBiobio
    126
  4. 4OsornoLos Lagos Region
    117
  5. 5VillarricaAraucania
    97
  6. 6ValdiviaLos Ríos Region
    93
  7. 7CuranilahueBiobio
    90
  8. 8Puente AltoSantiago Metropolitan
    90
  9. 9HualpénBiobio
    88
  10. 10CuricóMaule Region
    87
  11. 11RancaguaO'Higgins Region
    87
  12. 11Puerto MonttLos Lagos Region
    87
  13. 13TemucoAraucania
    86
  14. 13SantiagoSantiago Metropolitan
    86
  15. 15Puerto AysénAysén
    86
  16. 16San CarlosÑuble
    85
  17. 17Los ÁngelesBiobio
    84
  18. 18RengoO'Higgins Region
    82
  19. 19HualquiBiobio
    82
  20. 20TalaganteSantiago Metropolitan
    80
  21. 20CoronelBiobio
    80
  22. 22ConcónValparaiso
    80
  23. 23TocopillaAntofagasta
    79
  24. 24QuinteroValparaiso
    76
  25. 25LinaresMaule Region
    76
  26. 26CopiapóAtacama
    75
  27. 27ChillánÑuble
    74
  28. 28QuilpuéValparaiso
    74
  29. 28AntofagastaAntofagasta
    74
  30. 30TalcaMaule Region
    73
  31. 31AricaArica y Parinacota Region
    73
  32. 32TalcahuanoBiobio
    71
  33. 33ChiguayanteBiobio
    71
  34. 34ToméBiobio
    70
  35. 34QuillotaValparaiso
    70
  36. 34ConcepciónBiobio
    70
  37. 37CoquimboCoquimbo Region
    69
  38. 38San Pedro de la PazBiobio
    69
  39. 39La SerenaCoquimbo Region
    68
  40. 40Alto HospicioTarapacá
    68
  41. 41Viña del MarValparaiso
    66
  42. 41CalamaAntofagasta
    66
  43. 43CauquenesMaule Region
    66
  44. 44LotaBiobio
    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, September 2025 · Chile now

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SmogRank, most polluted cities in Chile, PM2.5, September 2025, smogrank.com/cl/history/2025-09 (accessed 2 Oct 2026).

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