SmogRank / World / South America

Most polluted cities in South America

0 of 7 measured cities in 2 countries were above the WHO 24-hour guideline over the last 24 hours. The worst was Asunción, Paraguay, at 11.4 µg/m³.

VenezuelaUruguaySouth Georgia and the South Sandwich IslandsFalkland IslandsTrinidad and TobagoSurinameSaint Vincent and the GrenadinesSaint LuciaPeruParaguay: 1 measured cityPanamaNicaraguaArubaCuracaoMexico: 28 measured citiesHonduras: 1 measured cityGuyanaGrenadaFrance: 81 measured citiesEcuadorCosta RicaColombiaChileCabo VerdeBrazil: 6 measured citiesBoliviaBarbadosArgentina
Each dot is a measured city, coloured by its PM2.5 over the last 24 hours; tap a country to open it.
← Asunción 11.4 µg/m³ 15 µg/m³ 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
Paraguay111.4 Asunción 11.4
Brazil66.3 Nilópolis 10.6

Worst cities

  1. 1Asunciónlow-cost sensorsAsuncion, Paraguay 550.8×
  2. 2NilópolisRio de Janeiro, Brazil 540.7×
  3. 3ItaguaíRio de Janeiro, Brazil 390.5×
  4. 4Duque de CaxiasRio de Janeiro, Brazil 360.4×
  5. 5Barra da TijucaRio de Janeiro, Brazil 330.4×
  6. 6AcariRio de Janeiro, Brazil 330.4×
  7. 7Rio de JaneiroRio de Janeiro, Brazil 320.4×
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.