Air Quality Lab — Segbwema, Sierra Leone
Air Quality Profile·
Segbwema reports an annual PM2.5 of 23.4 µg/m³. That's meaningfully above the WHO 2021 guideline of 5 µg/m³ yet within the EU annual limit of 25 µg/m³.
Segbwema
Sierra Leone
Sierra LeoneAnnual Average
ModerateWHO annual classification
23.4µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
4646 µg/m³ — Unhealthy
4242 µg/m³ — Unhealthy
3232 µg/m³ — Poor
3232 µg/m³ — Poor
1414 µg/m³ — Fair
9.69.6 µg/m³ — Good
1212 µg/m³ — Fair
1111 µg/m³ — Fair
1212 µg/m³ — Fair
1515 µg/m³ — Fair
2323 µg/m³ — Moderate
3434 µg/m³ — Poor
Jan
Feb
Mar
Apr
May
Jun
4646 µg/m³ — Unhealthy
4242 µg/m³ — Unhealthy
3232 µg/m³ — Poor
3232 µg/m³ — Poor
1414 µg/m³ — Fair
9.69.6 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
1212 µg/m³ — Fair
1111 µg/m³ — Fair
1212 µg/m³ — Fair
1515 µg/m³ — Fair
2323 µg/m³ — Moderate
3434 µg/m³ — Poor
Best months: Jun, Aug–SepWorst months: Jan–Feb, Dec
Good5–10 µg/m³Fair10–15 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
Segbwema: 23.4 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