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
    12.7
  2. 2Duque de CaxiasRio de Janeiro
    8.6
  3. 3AcariRio de Janeiro
    7.4
  4. 4Rio de JaneiroRio de Janeiro
    6.7
  5. 5Barra da TijucaRio de Janeiro
    5.4
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. 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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