The vice Dean of China Law University, He Bing put this photo on his blog: after 10 days' use, he washed his new air purifier, this is the result.

Thousands of Chinese bloggers have passed this photo around, and wonder how their lungs take all this in just days?!

Business booming!! ... On 4th Dec, Taobao, a Chinese online shop sold 30 thousands fabric face musks,  3 times the number of sales of past 2 weeks; on 5th Dec it sold 80 thousand face masks, 30 thousand to Beijing buyers. The sale of air filters also  increased by a multiple of 5.

Mr. He Bing's family live at the outer circle of the Beijing CBD, "five ring" area,  marked with red line below.

Unfortunately: The Economist Intelligence Unit (EIU) published their finding:

Beijing -- The most livable city in Mainland China