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