SmogRank / World / Reunion / Reunion
Most polluted cities in Reunion, Reunion
1 measured city, last 30 days; 0 above the WHO 24-hour guideline. The only one: Saint-Denis at 3.1 µg/m³, #2,787 in the world.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Saint-Denislast full day 3 Oct 0%
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
Estimated: cities without a monitor
Reunion cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Saint-Pierre | ≈ 7 µg/m³ |
| Le Tampon | ≈ 7 µg/m³ |
| Saint-André | ≈ 8 µg/m³ |
| Saint-Louis | ≈ 7 µg/m³ |
| Saint-Joseph | ≈ 7 µg/m³ |
| Saint-Benoît | ≈ 7 µg/m³ |
| La Possession | ≈ 8 µg/m³ |
| Saint-Leu | ≈ 7 µg/m³ |
| Sainte-Marie | ≈ 8 µg/m³ |
| Le Port | ≈ 8 µg/m³ |
| Piton Saint-Leu | ≈ 7 µg/m³ |
| Sainte-Suzanne | ≈ 8 µg/m³ |
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SmogRank, most polluted cities in Reunion, Reunion, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/re/region/reunion?w=30d.
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.
Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.