SmogRank / Countries / Brazil / March 2026

Most polluted cities in Brazil, March 2026

5 cities in Brazil ranked by their average PM2.5 over the 31 days. Worst: Nilópolis at 13.6 µg/m³, #642 of 2,332 cities in the world. Cleanest: Rio de Janeiro at 5.2. A city needs measurements on 70% of the days to be ranked.

  1. 1NilópolisRio de Janeiro
    13.6
  2. 2Duque de CaxiasRio de Janeiro
    8.2
  3. 3AcariRio de Janeiro
    6.4
  4. 4Barra da TijucaRio de Janeiro
    5.3
  5. 5Rio de JaneiroRio de Janeiro
    5.2
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, March 2026 · Brazil now