SmogRank / Dakar / Saint-Louis
Dakar vs Saint-Louis: PM2.5 compared
Over the last year, Saint-Louis's air was 16% more polluted than Dakar's: PM2.5 averaged 14.9 µg/m³ against 12.9, on the 183 days both cities were measured. Saint-Louis had the dirtier air on 48 of those days, Dakar on 132. Saint-Louis was over the WHO's daily guideline of 15 µg/m³ on 44 of them, Dakar on 57.
Right now
The last year, day by day
Month by month
Each city's worst days
Dakar
- 2 Apr 202611641.4 µg/m³
- 28 May 20269733.8 µg/m³
- 1 Apr 20269532.8 µg/m³
Saint-Louis
- 21 Sept 2026469309.7 µg/m³
- 17 Sept 2026314231.9 µg/m³
- 9 Sept 2026220145.0 µg/m³
Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.
Compare either city with another
Dakar
Side by side with Thiès (the nearest), Gujranwala (the world's worst on 30 days).
Saint-Louis
Side by side with Thiès (the nearest), Ziguinchor (Senegal's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Dakar and Saint-Louis, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/sn-dakar/sn-saint-louis (accessed 9 Oct 2026).
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.
The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.
Updated 2026-10-09 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).