SmogRank / Countries / Brazil / January 2026

Most polluted cities in Brazil, January 2026

5 cities in Brazil ranked by their average PM2.5 over the 31 days. Worst: Nilópolis at 13.4 µg/m³, #551 of 2,047 cities in the world. Cleanest: Barra da Tijuca at 6.4. A city needs measurements on 70% of the days to be ranked.

  1. 1NilópolisRio de Janeiro
    13.4
  2. 2Duque de CaxiasRio de Janeiro
    8.8
  3. 3AcariRio de Janeiro
    7.7
  4. 4Rio de JaneiroRio de Janeiro
    7.2
  5. 5Barra da TijucaRio de Janeiro
    6.4
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, January 2026 · Brazil now

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SmogRank, most polluted cities in Brazil, PM2.5, January 2026, smogrank.com/br/history/2026-01 (accessed 2 Oct 2026).

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