PM2.5 is airborne particulate matter with a diameter of 2.5 micrometers or less. Breathing fine particles is a health risk. The World Health Organization (WHO) links outdoor air pollution with cardiovascular disease, respiratory disease, and lung cancer. Risk varies with the level and duration of exposure and a person’s health; exposure does not mean that everyone will develop the same illness.
Where to check air-quality readings
Check area-specific readings through Air4Thai, the Pollution Control Department’s air-quality system, and review announcements from public-health agencies. Readings can change by location and time.
Reduce exposure when pollution is high
- Adjust or reduce outdoor activities based on local readings and announcements.
- When air quality is poor, close openings that let outdoor air inside and use a cleaner-air space when possible.
- If you need to go outside, use a well-fitting mask appropriate for fine particles and follow official guidance.
- Children, older adults, pregnant people, and people with heart or lung conditions should follow advice specific to them from a clinician and health authorities.
Thailand’s PM2.5 standard is a 24-hour average of no more than 37.5 micrograms per cubic meter under an announcement effective June 1, 2023. This is a daily average, not a momentary reading or an annual average. Activity and health guidance may change with conditions. Check the latest Department of Health announcements and local Air4Thai readings before planning activities.
Check the air-quality information and guidance issued for your location and day because readings change. Do not rely on claims that food or products “detox” the body instead of reducing exposure.
Sources
- WHO: Ambient (outdoor) air pollution and health
- Pollution Control Department: Air4Thai
- Department of Health: Guidance for responding to PM2.5
- Pollution Control Department: Thailand’s 24-hour PM2.5 standard