SmogRank / World / Reunion / Reunion / September 2025

Most polluted cities in Reunion, Reunion, September 2025

1 city in Reunion, Reunion ranked by their average PM2.5 over the 30 days. The only one: Saint-Denis at 5.6 µg/m³, #2,232 of 3,052 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Saint-Denis
    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

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SmogRank, most polluted cities in Reunion, Reunion, PM2.5, September 2025, smogrank.com/re/region/reunion/history/2025-09 (accessed 7 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.