BANGKOK : Government agencies in Chiang Mai were ordered to let staff work from home on Friday (April 7) as levels of PM2.5 smog surged to almost unprecedented levels. In an urgent announcement issued on Friday morning, Chiang Mai governor Nirat Pongsitthavorn said officials who can work from home or online without impacting public services should be allowed to do so. The announcement cited PM2.5 levels of between 112 and 398 micrograms per cubic metre of air (μg/m3) in the previous 24 hours. The safe level of PM2.

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