What is the air quality in Koh Samui?

Koh Samui, Thailand has an annual US AQI of 60 (Reasonable) and average PM2.5 of 14.2 µg/m³, ranking #2136 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Koh Samui?

August is typically the cleanest month (AQI 53) and January the most polluted (AQI 72).

PM2.5: 1998–2024 (satellite). From satellite data, because no government monitor covers the city. Full sources are on the methodology page.

Global rank	City	Continent	AQI	PM2.5
2136	Koh Samui, Thailand	Asia	AQI 60	PM2.5 14.2 µg/m³