SmogRank / World / Brazil / October 2026

Most polluted cities in Brazil, October 2026

6 cities in Brazil ranked by their average PM2.5 so far (1 of 31 days). Worst: Nilópolis at 10.1 µg/m³, #1,032 of 2,606 cities in the world. Cleanest: Duque de Caxias at 5.8. A city needs measurements on 70% of the days to be ranked.

← Nilópolis 10.1 µg/m³ 20 µg/m³0
Every city in Brazil ranked for October 2026, 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. 1NilópolisRio de Janeiro
    53
  2. 2ItaguaíRio de Janeiro
    40
  3. 3Barra da TijucaRio de Janeiro
    35
  4. 4AcariRio de Janeiro
    34
  5. 5Rio de JaneiroRio de Janeiro
    33
  6. 6Duque de CaxiasRio de Janeiro
    32
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, October 2026 · Brazil now

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SmogRank, most polluted cities in Brazil, PM2.5, October 2026 (so far), smogrank.com/br/history/2026-10 (accessed 2 Oct 2026).

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