SmogRank / World / South America

Most polluted cities in South America

54 of 54 measured cities in 3 countries were above the WHO annual guideline so far this year. The worst was Coyhaique, Chile, at 66.9 µg/m³.

VenezuelaUruguaySouth Georgia and the South Sandwich IslandsFalkland IslandsTrinidad and TobagoSurinameSaint Vincent and the GrenadinesSaint LuciaPeru: 5 measured citiesParaguayPanamaNicaraguaArubaCuracaoMexico: 42 measured citiesHonduras: 1 measured cityGuyanaGrenadaFrance: 100 measured citiesEcuadorCosta RicaColombiaChile: 44 measured citiesCabo VerdeBrazil: 5 measured citiesBoliviaBarbadosArgentina
Each dot is a measured city, coloured by its PM2.5 so far this year; tap a country to open it.
← Coyhaique 66.9 µg/m³ 60 µg/m³5 WHO annual guideline
Every measured city in South America, 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.

Countries

CountryCitiesMedianCities by bandWorst city
Chile4431.8 Coyhaique 66.9
Peru521.9 Santa Anita - Los Ficus 26.5
Brazil58.1 Nilópolis 18.0

Worst cities

  1. 1CoyhaiqueAysén, Chile 15913.4×
  2. 2OsornoLos Lagos Region, Chile 1369.9×
  3. 3Puerto VarasLos Lagos Region, Chile 1309.5×
  4. 4HualpénBiobio, Chile 1228.8×
  5. 5NacimientoBiobio, Chile 1218.8×
  6. 6LinaresMaule Region, Chile 1148.1×
  7. 7CuranilahueBiobio, Chile 1128.0×
  8. 8CuricóMaule Region, Chile 1097.8×
  9. 9ValdiviaLos Ríos Region, Chile 1087.7×
  10. 10La UniónLos Ríos Region, Chile 1057.4×
  11. 11ChillánÑuble, Chile 1027.2×
  12. 12San CarlosÑuble, Chile 1017.1×
  13. 13VillarricaAraucania, Chile 1017.1×
  14. 14TemucoAraucania, Chile 1007.0×
  15. 15HualquiBiobio, Chile 986.8×
  16. 16SantiagoSantiago Metropolitan, Chile 976.8×
  17. 17RancaguaO'Higgins Region, Chile 966.7×
  18. 18Puerto MonttLos Lagos Region, Chile 966.7×
  19. 19RengoO'Higgins Region, Chile 966.6×
  20. 20Puerto AysénAysén, Chile 966.6×
  21. 21TalaganteSantiago Metropolitan, Chile 956.6×
  22. 22Los ÁngelesBiobio, Chile 936.4×
  23. 23TalcaMaule Region, Chile 936.3×
  24. 24Puente AltoSantiago Metropolitan, Chile 926.2×
  25. 25TalcahuanoBiobio, Chile 906.1×
All cities in the world
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

Updated 2026-10-02 08:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.