Real-time air quality index (AQI) for Chiang Mai, updated every 30 minutes from monitoring stations. Current readings for PM2.5, PM10, and ozone. 24-hour trend chart showing how air quality changes throughout the day. Health advice based on current conditions: when to wear N95 masks, when to stay indoors, and when it is safe for outdoor activities. 7-day PM2.5 forecast. Chiang Mai burning season runs February to April with AQI regularly exceeding 200. This page helps travelers and residents make daily decisions about outdoor activities based on real data, not guesswork. Data provided by Open-Meteo, a free open-source air quality API.