SmogRank / World / Reunion / December 2025

Most polluted cities in Reunion, December 2025

1 city in Reunion ranked by their average PM2.5 over the 31 days. Worst: Saint-Denis at 4.0 µg/m³, #2,537 of 2,638 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Saint-DenisReunion
    22
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, December 2025 · Reunion now

Use this board

SmogRank, most polluted cities in Reunion, PM2.5, December 2025, smogrank.com/re/history/2025-12 (accessed 2 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.