SmogRank / World / Brazil / September 2025

Most polluted cities in Brazil, September 2025

3 cities in Brazil ranked by their average PM2.5 over the 30 days. Worst: Duque de Caxias at 9.8 µg/m³, #631 of 2,711 cities in the world. Cleanest: Acari at 8.3. A city needs measurements on 70% of the days to be ranked.

← Duque de Caxias 9.8 µg/m³ 20 µg/m³0
Every city in Brazil ranked for September 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Duque de CaxiasRio de Janeiro
    52
  2. 2Rio de JaneiroRio de Janeiro
    48
  3. 3AcariRio de Janeiro
    46
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, September 2025 · Brazil now

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SmogRank, most polluted cities in Brazil, PM2.5, September 2025, smogrank.com/br/history/2025-09 (accessed 2 Oct 2026).

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