SmogRank / Countries / Brazil / September 2026

Most polluted cities in Brazil, September 2026

6 cities in Brazil ranked by their average PM2.5 over the 30 days. Worst: Nilópolis at 14.3 µg/m³, #252 of 2,332 cities in the world. Cleanest: Rio de Janeiro at 5.6. A city needs measurements on 70% of the days to be ranked.

  1. 1NilópolisRio de Janeiro
    14.3
  2. 2Duque de CaxiasRio de Janeiro
    9.1
  3. 3ItaguaíRio de Janeiro
    8.3
  4. 4Barra da TijucaRio de Janeiro
    6.8
  5. 5AcariRio de Janeiro
    6.3
  6. 6Rio de JaneiroRio de Janeiro
    5.6
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, September 2026 · Brazil now

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SmogRank, most polluted cities in Brazil, PM2.5, September 2026, smogrank.com/br/history/2026-09 (accessed 2 Oct 2026).

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