SmogRank / Countries / Laos / 2026
Most polluted cities in Laos, 2026
1 city in Laos ranked by their average PM2.5 so far (273 of 365 days); 1 above the WHO annual guideline (5.0 µg/m³). Worst: Vientiane at 36.4 µg/m³, #77 of 2,181 cities in the world. A city needs measurements on 70% of the days to be ranked.
- 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+
All cities in the world, 2026 · Laos now
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SmogRank, most polluted cities in Laos, PM2.5, 2026 (so far), smogrank.com/la/history/2026 (accessed 2 Oct 2026).
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