SmogRank / World / Asia / Laos
Most polluted cities in Laos
1 measured city, last 24 hours; 1 above the WHO 24-hour guideline. Worst: Vientiane at 25.4 µg/m³, #41 in the world.
- 1Vientianelow-cost sensorsVientiane Prefecture 25.41.7×
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 |
| Ban Laongam | ≈ 6 µg/m³ |
| Sekong | ≈ 5 µg/m³ |
| Borikhan | ≈ 5 µg/m³ |
| Ban Kèngkok | ≈ 5 µg/m³ |
| Ban Houakhoua | ≈ 5 µg/m³ |
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SmogRank, most polluted cities in Laos, PM2.5, last 24 hours to 2 Oct 2026, 01:00 UTC, smogrank.com/la.
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Updated 2026-10-02 01:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.