Air Quality Lab — Bo, Sierra Leone
Air Quality Profile·
Bo reports an annual PM2.5 of 26.5 µg/m³. That's above the EU annual limit of 25 µg/m³ — long-term exposure here carries documented health trade-offs.
Bo
Sierra Leone
Sierra LeoneAnnual Average
PoorWHO annual classification
26.5µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
4747 µg/m³ — Unhealthy
4141 µg/m³ — Unhealthy
3333 µg/m³ — Poor
3939 µg/m³ — Unhealthy
2323 µg/m³ — Moderate
1212 µg/m³ — Fair
1616 µg/m³ — Moderate
1616 µg/m³ — Moderate
1313 µg/m³ — Fair
1616 µg/m³ — Moderate
2626 µg/m³ — Poor
3636 µg/m³ — Unhealthy
Jan
Feb
Mar
Apr
May
Jun
4747 µg/m³ — Unhealthy
4141 µg/m³ — Unhealthy
3333 µg/m³ — Poor
3939 µg/m³ — Unhealthy
2323 µg/m³ — Moderate
1212 µg/m³ — Fair
Jul
Aug
Sep
Oct
Nov
Dec
1616 µg/m³ — Moderate
1616 µg/m³ — Moderate
1313 µg/m³ — Fair
1616 µg/m³ — Moderate
2626 µg/m³ — Poor
3636 µg/m³ — Unhealthy
Best months: Jun, Sep–OctWorst months: Jan–Feb, Apr
Fair10–15 µg/m³Moderate15–25 µg/m³Poor25–35 µg/m³Unhealthy35–50 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Sierra Leone
Bo: 26.5 µg/m³. Typical range in Sierra Leone: 23.7–26.5 µg/m³. Low anchor: Bumpe, 23.3 µg/m³. High anchor: Freetown, 27.9 µg/m³.
12 cities tracked