SmogRank / Countries / Laos / 2025

Most polluted cities in Laos, 2025

1 city in Laos ranked by their average PM2.5 over the 365 days; 1 above the WHO annual guideline (5.0 µg/m³). Worst: Vientiane at 27.7 µg/m³, #127 of 2,131 cities in the world. A city needs measurements on 70% of the days to be ranked.

  1. 1Vientianelow-cost sensorsVientiane Prefecture
    27.75.5×
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, 2025 · Laos now

Use this board

SmogRank, most polluted cities in Laos, PM2.5, 2025, smogrank.com/la/history/2025 (accessed 2 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.