Air Quality Lab — Jamestown, Saint Helena
Air Quality Profile·
Jamestown reports an annual PM2.5 of 3.0 µg/m³. That's below the WHO 2021 annual guideline of 5 µg/m³ — cleaner than most cities on the continent.
Jamestown
Saint Helena
Saint HelenaAnnual Average
ExcellentWHO annual classification
3.0µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
3.43.4 µg/m³ — Excellent
2.92.9 µg/m³ — Excellent
2.72.7 µg/m³ — Excellent
2.82.8 µg/m³ — Excellent
2.72.7 µg/m³ — Excellent
3.03.0 µg/m³ — Excellent
3.73.7 µg/m³ — Excellent
3.73.7 µg/m³ — Excellent
2.92.9 µg/m³ — Excellent
2.52.5 µg/m³ — Excellent
2.82.8 µg/m³ — Excellent
2.32.3 µg/m³ — Excellent
Jan
Feb
Mar
Apr
May
Jun
3.43.4 µg/m³ — Excellent
2.92.9 µg/m³ — Excellent
2.72.7 µg/m³ — Excellent
2.82.8 µg/m³ — Excellent
2.72.7 µg/m³ — Excellent
3.03.0 µg/m³ — Excellent
Jul
Aug
Sep
Oct
Nov
Dec
3.73.7 µg/m³ — Excellent
3.73.7 µg/m³ — Excellent
2.92.9 µg/m³ — Excellent
2.52.5 µg/m³ — Excellent
2.82.8 µg/m³ — Excellent
2.32.3 µg/m³ — Excellent
Best months: Mar, Oct, DecWorst months: Jan, Jul–Aug
Excellent0–5 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared worldwide
Jamestown: 3.0 µg/m³. Typical range: 8.9–26.6 µg/m³. Low anchor: Bergen, 4.9 µg/m³. High anchor: Diepsloot, 162.1 µg/m³.
22,874 cities tracked