To blame were forest fires in the hills surrounding the valley. Readings by the Chiang Mai Air Quality Health Index (CMAQHI) showed air quality index (AQI) scores in Samoeng's tambon Yang Moen had exceeded 500, the highest level the AQI can record.
Forest fires in the hills surrounding the valley were to blame. Chiang Mai Air Quality Health Index (CMAQHI) data revealed that air quality index (AQI) scores in Samoeng's tambon Yang Moen surpassed 500, the highest level AQI can record.