SmogRank / World / Laos / April 2025

Most polluted cities in Laos, April 2025

3 cities in Laos ranked by their average PM2.5 over the 30 days. Worst: Ban Houakhoua at 54.4 µg/m³, #28 of 2,569 cities in the world. Cleanest: Pakxan at 32.2. A city needs measurements on 70% of the days to be ranked.

← Ban Houakhoua 54.4 µg/m³ 50 µg/m³0
Every city in Laos ranked for April 2025, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1Ban HouakhouaBokeo
    148
  2. 2Vientianelow-cost sensorsVientiane Prefecture
    124
  3. 3PakxanBolikhamsai
    94
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, April 2025 · Laos now

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SmogRank, most polluted cities in Laos, PM2.5, April 2025, smogrank.com/la/history/2025-04 (accessed 2 Oct 2026).

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