SmogRank / World / Reunion / September 2025

Most polluted cities in Reunion, September 2025

1 city in Reunion ranked by their average PM2.5 over the 30 days. Worst: Saint-Denis at 5.6 µg/m³, #2,021 of 2,711 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Saint-DenisReunion
    31
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 · Reunion now

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

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