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Thailand
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See AQI readings on the Air Quality and Noise Management Bureau website (in Thai) |
Background
Several factors have contributed to air pollution in Thailand. Rapid industrial growth and an increase in the number of vehicles are the main leading causes, particularly in Bangkok. Agricultural burning in Southeast Asia often causes haze between June and September. Farmers in Thailand's north and north-eastern provinces also burn agricultural waste during the dry season from February to May.
Thailand ratified the ASEAN Agreement on Transboundary Haze Pollution in September 2003. The agreement binds all ASEAN nations to reduce pollution in Southeast Asia.
Air Quality Measurement
Air Quality Index (AQI) indicates the status of air quality in a particular location. It is calculated based on data collected monitoring stations throughout the country. The process is completed hourly, and readings are updated on the website.
Pollutants being measured include: particulate matter (PM2.5 and PM10), sulphur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3) and carbon monoxide (CO).
AQI and health advice
| AQI VALUE | AIR QUALITY DESCRIPTOR | WARNING MESSAGE |
| 0-25 | Very Good | All citizens can carry on with their lives normally. |
| 26-50 | Good |
General public: can enjoy outdoor activities and travel as usual. |
| 51-100 | Moderate | General public: Reduce the amount of time spent doing outdoor activities or strenuous exercise. People at risk: Use personal protective equipment such as a PM 2.5 mask every time you go outside. Reduce the duration of outdoor activities or strenuous exercise. If you have any unusual symptoms, consult a doctor immediately. |
| 101-200 | Begin to affect health | General public: Use personal protective equipment such as a PM 2.5 mask every time you go outside, limit the time you spend in strenuous physical activities, watch for unusual symptoms such as coughing, difficulty breathing, and eye irritation. People at risk: Use personal protective equipment such as a PM 2.5 mask every time you go out, avoid strenuous activities outdoors, follow doctor's advice and seek medical care immediately if you have any symptoms. |
| Above 201 | Affecting health | Everyone should avoid outdoor activities, avoid areas with high air pollution and always use personal protective equipment such as PM 2.5 mask. If there are health symptoms, you should consult a doctor immediately. |
Reviewed: September 2026
