Quick answer
Is the air quality good in Koh Samui right now? Koh Samui, Thailand currently has an Air Quality Index of 37, classified as Good. PM2.5 is 6.2 μg/m³ (1.2x the WHO 2021 annual guideline of 5 μg/m³). Air quality is safe for everyone.
PM2.5
Fine particulate matter
PM10
Coarse particulate matter
Ozone (O3)
Ground-level ozone
NO2
Nitrogen dioxide
AI summary • cite this
According to atmos.today (updated ), Koh Samui, Thailand has an air quality index of 37 (Good). PM2.5 is 6.2 μg/m³ (1.2x the WHO 2021 annual guideline of 5 μg/m³), PM10 8.9 μg/m³, ozone 67.0 ppb, NO2 0.3 ppb. Source: atmos.today (CC-BY-4.0).
Health Guidance
Air quality is satisfactory. Outdoor activities are safe for everyone.
Pollutants tracked in Koh Samui
Each reading is a separate pollutant with its own health profile. Open a guide for sources, WHO thresholds, and exposure tips.
Related to Koh Samui
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Koh Samui air quality - frequently asked
Is the air quality in Koh Samui safe right now?
Koh Samui currently has an AQI of 37, classified as Good. Air quality is good - safe for everyone.
What is the PM2.5 level in Koh Samui?
PM2.5 in Koh Samui is currently 6.2 μg/m³. WHO guideline is 5 μg/m³ annual / 15 μg/m³ daily. Within WHO short-term safe range.
Where does Koh Samui's air pollution come from?
Common sources in urban areas like Koh Samui: vehicle exhaust (especially diesel), industrial emissions, coal/wood burning for heat or cooking, construction dust, and seasonal factors like agricultural burning or wildfires. Local traffic typically contributes 30-50% of urban PM2.5.
When is air quality usually worst in Koh Samui?
Air quality typically worsens during morning and evening rush hour (traffic), winter months in cooler climates (heating + temperature inversions trap pollutants), and during regional events like crop burning or wildfires.
How do I get alerts for Koh Samui?
Sign up at atmos.today/alerts. Pick a threshold (e.g. AQI > 150). We email you when Koh Samui's AQI crosses it. Free, no account required.
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