SmogRank / World / Brazil / February 2026

Most polluted cities in Brazil, February 2026

5 cities in Brazil ranked by their average PM2.5 over the 28 days. Worst: Nilópolis at 11.3 µg/m³, #1,052 of 2,520 cities in the world. Cleanest: Barra da Tijuca at 5.1. A city needs measurements on 70% of the days to be ranked.

← Nilópolis 11.3
Every city in Brazil ranked for February 2026, 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
    55
  2. 2Duque de CaxiasRio de Janeiro
    40
  3. 3AcariRio de Janeiro
    37
  4. 4Rio de JaneiroRio de Janeiro
    34
  5. 5Barra da TijucaRio de Janeiro
    28
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, February 2026 · Brazil now

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SmogRank, most polluted cities in Brazil, PM2.5, February 2026, smogrank.com/br/history/2026-02 (accessed 2 Oct 2026).

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