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 µg/m³ 20 µg/m³0
Every city in Brazil ranked for February 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
    11.3
  2. 2Duque de CaxiasRio de Janeiro
    7.2
  3. 3AcariRio de Janeiro
    6.7
  4. 4Rio de JaneiroRio de Janeiro
    6.1
  5. 5Barra da TijucaRio de Janeiro
    5.1
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, 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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