SmogRank / Countries / Brazil / May 2026
Most polluted cities in Brazil, May 2026
6 cities in Brazil ranked by their average PM2.5 over the 31 days. Worst: Nilópolis at 16.9 µg/m³, #219 of 2,243 cities in the world. Cleanest: Rio de Janeiro at 7.4. A city needs measurements on 70% of the days to be ranked.
- 1NilópolisRio de Janeiro 16.9
- 2ItaguaíRio de Janeiro 11.9
- 3Duque de CaxiasRio de Janeiro 11.5
- 4AcariRio de Janeiro 7.6
- 4Barra da TijucaRio de Janeiro 7.6
- 6Rio de JaneiroRio de Janeiro 7.4
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+