SmogRank / World / South America

Most polluted cities in South America

46 of 52 measured cities in 4 countries were above the WHO 24-hour guideline over the last 7 days. The worst was Coyhaique, Chile, at 55.4 µg/m³.

VenezuelaUruguaySouth Georgia and the South Sandwich IslandsFalkland Islands: 1 measured cityTrinidad and TobagoSurinameSaint Vincent and the GrenadinesSaint LuciaPeruParaguay: 1 measured cityPanamaNicaraguaArubaCuracaoMexico: 41 measured citiesHonduras: 1 measured cityGuyanaGrenadaFrance: 94 measured citiesEcuadorCosta RicaColombiaChile: 44 measured citiesCabo VerdeBrazil: 6 measured citiesBoliviaBarbadosArgentina
Each dot is a measured city, coloured by its PM2.5 over the last 7 days; tap a country to open it.
← Coyhaique 55.4 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
Chile4420.3 Coyhaique 55.4
Paraguay118.2 Asunción 18.2
Brazil69.3 Nilópolis 17.5
Falkland Islands10.1 Stanley 0.1

Worst cities

  1. 1CoyhaiqueAysén, Chile 150
  2. 2VillarricaAraucania, Chile 112
  3. 3OsornoLos Lagos Region, Chile 111
  4. 4HualpénBiobio, Chile 101
  5. 5NacimientoBiobio, Chile 92
  6. 6CuranilahueBiobio, Chile 91
  7. 7Puerto VarasLos Lagos Region, Chile 90
  8. 8ValdiviaLos Ríos Region, Chile 89
  9. 9ChillánÑuble, Chile 84
  10. 10TemucoAraucania, Chile 83
  11. 11RancaguaO'Higgins Region, Chile 81
  12. 12Puerto AysénAysén, Chile 81
  13. 13SantiagoSantiago Metropolitan, Chile 80
  14. 14La UniónLos Ríos Region, Chile 80
  15. 15TocopillaAntofagasta, Chile 79
  16. 16Puerto MonttLos Lagos Region, Chile 78
  17. 17Puente AltoSantiago Metropolitan, Chile 78
  18. 18San CarlosÑuble, Chile 76
  19. 19HualquiBiobio, Chile 75
  20. 20CoronelBiobio, Chile 74
  21. 21RengoO'Higgins Region, Chile 74
  22. 22Los ÁngelesBiobio, Chile 72
  23. 23AricaArica y Parinacota Region, Chile 72
  24. 24CuricóMaule Region, Chile 70
  25. 25LinaresMaule Region, Chile 70
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 07:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.