SmogRank / World / Brazil / December 2025

Most polluted cities in Brazil, December 2025

5 cities in Brazil ranked by their average PM2.5 over the 31 days. Worst: Nilópolis at 12.7 µg/m³, #858 of 2,638 cities in the world. Cleanest: Barra da Tijuca at 5.4. A city needs measurements on 70% of the days to be ranked.

← Nilópolis 12.7
Every city in Brazil ranked for December 2025, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1NilópolisRio de Janeiro
    58
  2. 2Duque de CaxiasRio de Janeiro
    48
  3. 3AcariRio de Janeiro
    41
  4. 4Rio de JaneiroRio de Janeiro
    37
  5. 5Barra da TijucaRio de Janeiro
    30
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, December 2025 · Brazil now

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SmogRank, most polluted cities in Brazil, PM2.5, December 2025, smogrank.com/br/history/2025-12 (accessed 2 Oct 2026).

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