With the rapid development of society, the continuous expansion of urbanization and industrialization leads to serious air pollution. The work selects the Chinese characters of the names of cities Beijing, Wuhan and Xi 'an,and the smog particles are abstracted and enlarged into different dots attached to the Chinese characters, showing some visible strokes. The grainy compositions of the iconic city buildings the Temple of Heaven, Yellow Crane Tower and the Great Wild Goose Pagoda are looming in the background. It implies that the haze constantly envelops the city and harms the health of people.