Thai tourist hotspot Chiang Mai tops world’s most polluted cities
CHIANG MAI, Thailand: Thai tourist hotspot Chiang Mai was blanketed by hazy smog Friday, as residents and visitors to the usually picturesque northern city were left wheezing in the toxic air. The country’s second largest city topped air monitoring website IQAir’s table of the world’s most polluted cities early Friday.Levels of PM2.5 pollutants — cancer-causing…