SmogRank / World / South America

Most polluted cities in South America

44 of 52 measured cities in 4 countries were above the WHO 24-hour guideline over the last 30 days. The worst was Coyhaique, Chile, at 51.7 µg/m³.

VenezuelaUruguaySouth Georgia and the South Sandwich IslandsFalkland Islands: 1 measured cityTrinidad and TobagoSurinameSaint Vincent and the GrenadinesSaint LuciaPeruParaguay: 1 measured cityPanamaNicaraguaArubaCuracaoMexico: 40 measured citiesHonduras: 1 measured cityGuyanaGrenadaFrance: 102 measured citiesEcuadorCosta RicaColombiaChile: 44 measured citiesCabo VerdeBrazil: 6 measured citiesBoliviaBarbadosArgentina
Each dot is a measured city, coloured by its PM2.5 over the last 30 days; tap a country to open it.
← Coyhaique 51.7 µg/m³ 50 µg/m³15 WHO 24-hour guideline0
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
Chile4423.3 Coyhaique 51.7
Paraguay116.7 Asunción 16.7
Brazil67.6 Nilópolis 14.1
Falkland Islands10.3 Stanley 0.3

Worst cities

  1. 1CoyhaiqueAysén, Chile 141
  2. 2Puerto VarasLos Lagos Region, Chile 123
  3. 3OsornoLos Lagos Region, Chile 106
  4. 4HualpénBiobio, Chile 105
  5. 5VillarricaAraucania, Chile 102
  6. 6Puerto MonttLos Lagos Region, Chile 102
  7. 7ValdiviaLos Ríos Region, Chile 99
  8. 8La UniónLos Ríos Region, Chile 96
  9. 9CuranilahueBiobio, Chile 92
  10. 10NacimientoBiobio, Chile 91
  11. 11Puerto AysénAysén, Chile 90
  12. 12TemucoAraucania, Chile 88
  13. 13HualquiBiobio, Chile 87
  14. 14ChillánÑuble, Chile 87
  15. 15Puente AltoSantiago Metropolitan, Chile 84
  16. 16SantiagoSantiago Metropolitan, Chile 84
  17. 17San CarlosÑuble, Chile 84
  18. 18RancaguaO'Higgins Region, Chile 84
  19. 19LinaresMaule Region, Chile 83
  20. 20CuricóMaule Region, Chile 80
  21. 21Los ÁngelesBiobio, Chile 79
  22. 22TalcaMaule Region, Chile 77
  23. 23RengoO'Higgins Region, Chile 77
  24. 24CoronelBiobio, Chile 77
  25. 25CauquenesMaule Region, Chile 75
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.