SmogRank / Countries / Brazil / 2026

Most polluted cities in Brazil, 2026

5 cities in Brazil ranked by their average PM2.5 so far (273 of 365 days); 5 above the WHO annual guideline (5.0 µg/m³). Worst: Nilópolis at 18.0 µg/m³, #253 of 2,181 cities in the world. Cleanest: Rio de Janeiro at 7.5. A city needs measurements on 70% of the days to be ranked.

  1. 1NilópolisRio de Janeiro
    18.03.6×
  2. 2Duque de CaxiasRio de Janeiro
    11.62.3×
  3. 3Barra da TijucaRio de Janeiro
    8.11.6×
  4. 4AcariRio de Janeiro
    7.91.6×
  5. 5Rio de JaneiroRio de Janeiro
    7.51.5×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, 2026 · Brazil now