What is the air quality in Koidu?

Koidu, Sierra Leone has an annual US AQI of 70 (Polluted) and average PM2.5 of 19.4 µg/m³, ranking #3237 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Koidu?

September is typically the cleanest month (AQI 47) and January the most polluted (AQI 96).

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Global rank	City	Continent	AQI	PM2.5
3237	Koidu, Sierra Leone	Africa & Middle East	AQI 70	PM2.5 19.4 µg/m³