Air quality in Chiang Mai province was measured at 153 on the US AQI listing on Saturday . The most polluted city on Saturday was Calcutta, followed by Dhaka in Bangladesh (196), Lahore in Pakistan (184), Kathmandu in Nepal (180), Yangon (174), Bishkek in Kyrgyzstan (157) and Krakow in Poland (154) . Mae Chaem district recorded the most hotspots (48), followed by 27 in Hot