Smog is named for the mixture of smoke and fog in the air which is a serious air pollution in a number of cities. Recent years, the phenomenon that smog surrounded in buildings is common in China, especially in metropolis. More and more buildings stand because of the economic development and peoples' lives' needs, but the dense buildings result in smog staying around and continue to harm human health in the other hand. This poster transforms the Chinese character of “霾” to the real horrible phenomenon. If you look at it at a close distance, it may look beautiful just like the situation that people are enjoying the living environment, but if you pull back, you can see the “霾” clearly, and may fall into thinking- dense buildings are really benefit human beings? Smog metropolis has its dual character.