Monday, May 10, 2021, 12:05 GMT+7 A haze blankets Hue City, Thua Thien - Hue Province, Vietnam, May 9, 2021. Photo: Minh An / Tuoi Tre Thatch burning is allegedly the cause of a blanket of smog over Hue City in Vietnam's Thua Thien - Hue Province from Sunday morning to afternoon. The haze appeared around 10:00 am and lingered through 3:00 pm on the same day. Smoke covered most of the downtown area and reached the height of the Vincom shopping mall, the tallest building in the city, which is the capital of the central province. Its intensity did not decrease even at noon. Many locals complained that the blanket of smog was accompanied by a burning smell, allegedly caused by thatch burning.