1, introduction and motivation in Beijing in January
2013, for 25 consecutive days, haze: I was in Beijing, but when I recall this year, I remember what impression and feeling I had at that time, but I could not remember.Because everyone at that time said that this fog and haze were caused by accidental weather causes, they did not take the matter seriously.In that month, I also went to four places for business trip. In Henan, Shaanxi, Jiangxi and Zhejiang, I looked back at the sky in the camera. At that time, China was being involved in a heavy fog and haze covering 25 provinces and cities, and 600 million people. But I was in the middle of it.