Unsafe PM2.5 dust levels stay in lotsof northern provinces released : 16 Feb 2023 at 13: 30 Disaster mitigation authorities spray water over an uphill roadway in Chiang Mai’s Muang district on Thursday to lower the thick smog triggered by wildfires. (Photo: Panumet Tanraksa) CHIANG MAI: The air quality in this northern province, which hadactually been bad in the past 15 days due to the high levels of harmful ultra-fine PM2.5 dust particles, somewhat enhanced on Thursday earlymorning after some rain on Wednesday even
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