SmogRank / Saint-Louis / Ziguinchor
Saint-Louis vs Ziguinchor: PM2.5 compared
Over the last year, Saint-Louis's air was 36% more polluted than Ziguinchor's: PM2.5 averaged 15.2 µg/m³ against 11.2, on the 188 days both cities were measured. Saint-Louis had the dirtier air on 70 of those days, Ziguinchor on 118. Saint-Louis was over the WHO's daily guideline of 15 µg/m³ on 43 of them, Ziguinchor on 43.
Right now
The last year, day by day
Month by month
Each city's worst days
Saint-Louis
- 21 Sept 2026469309.7 µg/m³
- 17 Sept 2026314231.9 µg/m³
- 1 Oct 2026226151.2 µg/m³
Ziguinchor
- 16 May 20269532.9 µg/m³
- 3 Apr 20268627.7 µg/m³
- 19 Apr 20267924.1 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
Saint-Louis
Side by side with Thiès (the nearest), Gujranwala (the world's worst on 30 days).
Ziguinchor
Side by side with Brikama (the nearest), Thiès (Senegal's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Saint-Louis and Ziguinchor, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/sn-saint-louis/sn-ziguinchor (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 12:07 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).