What is the air quality in Vientiane?

Vientiane, Laos has an annual US AQI of 90 (Polluted) and average PM2.5 of 29.3 µg/m³, ranking #4256 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Vientiane?

July is typically the cleanest month (AQI 51) and March the most polluted (AQI 141).

Where does Vientiane's air quality data come from?

PM2.5: 1998–2026 (monitors 2019–2025, low-cost sensors 2025–2026, satellite 1998–2019, 2023–2024; 2025 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Vientiane, Laos — Air Quality & Clean City Guide 2026

Vientiane Air Quality Data

Global rank	City	Continent	AQI	PM2.5
4256	Vientiane, Laos	Asia	AQI 90	PM2.5 29.3 µg/m³