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
    2
  2. 2Duque de CaxiasRio de Janeiro
    1
  3. 3AcariRio de Janeiro
    1
  4. 4Rio de JaneiroRio de Janeiro
    1
  5. 5Barra da TijucaRio de Janeiro
    1
Low1–3
Moderate4–6
High7–9
Very high10

The UK's Daily Air Quality Index (1 to 10), PM2.5 bands. 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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