In several districts of the island, the air quality has decreased by 8 am today (11) and according to the American air quality index, 149 in Colombo city, 146 in Galle and Karapitiya cities, 151 in Badulla city, 143 in Polonnaruwa city, 149 in Puttalam city, 146 in Karapitiya city. It is reported that according to the data of the Department of Meteorology.