SmogRank / Countries / Brazil / 2025
Most polluted cities in Brazil, 2025
1 city in Brazil ranked by their average PM2.5 over the 365 days; 1 above the WHO annual guideline (5.0 µg/m³). Worst: Duque de Caxias at 9.1 µg/m³, #1,010 of 2,131 cities in the world. A city needs measurements on 70% of the days to be ranked.
- 1Duque de CaxiasRio de Janeiro 9.11.8×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+