Air Quality Lab — Vientiane, Laos
Air Quality Profile
Vientiane reports an annual PM2.5 of 30.9 µg/m³. That's above the EU annual limit of 25 µg/m³ — long-term exposure here carries documented health trade-offs.
Vientiane
Laos
LaosAnnual Average
PoorWHO annual classification
30.9µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
4545 µg/m³ — Unhealthy
3939 µg/m³ — Unhealthy
5151 µg/m³ — Very Unhealthy
4747 µg/m³ — Unhealthy
2626 µg/m³ — Poor
1717 µg/m³ — Moderate
1717 µg/m³ — Moderate
1717 µg/m³ — Moderate
1919 µg/m³ — Moderate
2626 µg/m³ — Poor
3333 µg/m³ — Poor
3535 µg/m³ — Unhealthy
Jan
Feb
Mar
Apr
May
Jun
4545 µg/m³ — Unhealthy
3939 µg/m³ — Unhealthy
5151 µg/m³ — Very Unhealthy
4747 µg/m³ — Unhealthy
2626 µg/m³ — Poor
1717 µg/m³ — Moderate
Jul
Aug
Sep
Oct
Nov
Dec
1717 µg/m³ — Moderate
1717 µg/m³ — Moderate
1919 µg/m³ — Moderate
2626 µg/m³ — Poor
3333 µg/m³ — Poor
3535 µg/m³ — Unhealthy
Best months: Jun–AugWorst months: Jan, Mar–Apr
Moderate15–25 µg/m³Poor25–35 µg/m³Unhealthy35–50 µg/m³Very Unhealthy50–75 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Laos
Vientiane: 30.9 µg/m³. Typical range in Laos: 24.8–30.5 µg/m³. Low anchor: Xam Nua, 22.4 µg/m³. High anchor: Luang Prabang, 31.4 µg/m³.
11 cities tracked