Most polluted cities in Laos
1 measured city ranked by PM2.5, last 30 days. Worst: Vientiane at 17.9 µg/m³, #191 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Vientiane low-cost sensorsVientiane Prefecture | 17.9 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
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 estimated | ≈ 5 µg/m³ |
| Thakhèk estimated | ≈ 5 µg/m³ |
| Pakse estimated | ≈ 6 µg/m³ |
| Ban Khoan estimated | ≈ 6 µg/m³ |
| Xam Nua estimated | ≈ 3 µg/m³ |
| Luang Prabang estimated | ≈ 4 µg/m³ |
| Muang Phônsavan estimated | ≈ 3 µg/m³ |
| Ban Xénô estimated | ≈ 5 µg/m³ |
| Muang Xay estimated | ≈ 4 µg/m³ |
| Vang Vieng estimated | ≈ 4 µg/m³ |
| Muang Sing estimated | ≈ 5 µg/m³ |
| Pakxan estimated | ≈ 5 µg/m³ |
| Ban Laongam estimated | ≈ 6 µg/m³ |
| Sekong estimated | ≈ 5 µg/m³ |
| Borikhan estimated | ≈ 5 µg/m³ |
| Ban Kèngkok estimated | ≈ 5 µg/m³ |
| Ban Houakhoua estimated | ≈ 5 µg/m³ |
Updated 2026-10-01 06:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.