What is the air quality in Jamestown?

Jamestown, Saint Helena has an annual US AQI of 18 (Excellent) and average PM2.5 of 3 µg/m³, ranking #11 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Jamestown?

April is typically the cleanest month (AQI 15) and August the most polluted (AQI 23).

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
11	Jamestown, Saint Helena	Africa & Middle East	AQI 18	PM2.5 3 µg/m³