Haze and thick smoke from forest fires on Sunday morning stalled a planned helicopter trip by Interior Minister Charupong Ruangsuwan and officials from Chiang Mai to the ravaged Karen refugee centre in Mae Hong Son's Khun Yuam district.
The volume of dust particles and haze in Chiang Mai on Sunday morning was measured at 175 microgrammes per cubic metre, much higher than the limit, causing many commercial flights to be postponed.
The weather conditions also halted the trip by helicopter of a group of officials led by Mr Charupong and Chatchai Promlert, director-general of the Disaster Prevention and Mitigation Department, who planned to fly from Chiang Mai to visit the refugee centre.
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