SmogRank / Countries / Laos / September 2026
Most polluted cities in Laos, September 2026
1 city in Laos ranked by their average PM2.5 over the 30 days. Worst: Vientiane at 17.9 µg/m³, #191 of 2,332 cities in the world. A city needs measurements on 70% of the days to be ranked.
- 1Vientianelow-cost sensorsVientiane Prefecture 17.9
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, September 2026 · Laos now
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SmogRank, most polluted cities in Laos, PM2.5, September 2026, smogrank.com/la/history/2026-09 (accessed 2 Oct 2026).
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