Photo taken on April 28, 2020 shows the scenery of a foggy morning in Canberra, Australia. (Photo by Liu Changchang/Xinhua)

Photo taken on April 28, 2020 shows the National Arboretum in thick fog in Canberra, Australia. (Photo by Liu Changchang/Xinhua)

Photo taken on April 28, 2020 shows Lake Burley Griffin in thick fog in Canberra, Australia. (Photo by Liu Changchang/Xinhua)

Photo taken on April 28, 2020 shows the scenery of a foggy morning in Canberra, Australia. (Photo by Liu Changchang/Xinhua)