Challenges in tackling PM2.5 crisis
Chiang Mai has repeatedly been named the world’s most air-polluted city this year. Not exactly a title to be envious about. The city was hit hard by PM2.5 ultra-fine dust on March 31. IQair.com, an air quality reporting website, reported Chiang Mai had an air quality index of 320 with an ultra-fine PM2.5 dust level […]