Most polluted cities in Laos
1 measured city, this year; 1 above the WHO annual guideline. Worst: Vientiane at 36.4 µg/m³, #77 in the world.
- 1Vientianelow-cost sensorsVientiane Prefecture 36.47.3×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
Estimated: cities without a monitor
Laos cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Savannakhet | ≈ 5 µg/m³ |
| Thakhèk | ≈ 5 µg/m³ |
| Pakse | ≈ 6 µg/m³ |
| Ban Khoan | ≈ 6 µg/m³ |
| Xam Nua | ≈ 3 µg/m³ |
| Luang Prabang | ≈ 4 µg/m³ |
| Muang Phônsavan | ≈ 3 µg/m³ |
| Ban Xénô | ≈ 5 µg/m³ |
| Muang Xay | ≈ 4 µg/m³ |
| Vang Vieng | ≈ 4 µg/m³ |
| Muang Sing | ≈ 5 µg/m³ |
| Pakxan | ≈ 5 µg/m³ |
| Ban Laongam | ≈ 6 µg/m³ |
| Sekong | ≈ 5 µg/m³ |
| Borikhan | ≈ 5 µg/m³ |
| Ban Kèngkok | ≈ 5 µg/m³ |
| Ban Houakhoua | ≈ 5 µg/m³ |
Updated 2026-10-01 23:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.