Air Quality Lab — Harper, Liberia
Air Quality Profile·
Harper reports an annual PM2.5 of 16.5 µg/m³. That's meaningfully above the WHO 2021 guideline of 5 µg/m³ yet within the EU annual limit of 25 µg/m³.
Harper
Liberia
LiberiaAnnual Average
ModerateWHO annual classification
16.5µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
3535 µg/m³ — Unhealthy
3737 µg/m³ — Unhealthy
1414 µg/m³ — Fair
1212 µg/m³ — Fair
7.47.4 µg/m³ — Good
9.99.9 µg/m³ — Good
1616 µg/m³ — Moderate
1111 µg/m³ — Fair
9.59.5 µg/m³ — Good
9.69.6 µg/m³ — Good
1010 µg/m³ — Good
2727 µg/m³ — Poor
Jan
Feb
Mar
Apr
May
Jun
3535 µg/m³ — Unhealthy
3737 µg/m³ — Unhealthy
1414 µg/m³ — Fair
1212 µg/m³ — Fair
7.47.4 µg/m³ — Good
9.99.9 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
1616 µg/m³ — Moderate
1111 µg/m³ — Fair
9.59.5 µg/m³ — Good
9.69.6 µg/m³ — Good
1010 µg/m³ — Good
2727 µg/m³ — Poor
Best months: May, Sep–OctWorst 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 Liberia
Harper: 16.5 µg/m³. Typical range in Liberia: 19.2–22.6 µg/m³. Low anchor: Buchanan, 14.2 µg/m³. High anchor: New Yekepa, 24.8 µg/m³.
16 cities tracked