A man wearing a mask walks over a bridge.The chimney of power plant behind is discharging smoke in the municipality of Chongqing, Southwest China. [Photo by Liu Song]

Large parts of China continue to suffer from the smog, with the most serious air contamination in recent years.

Despite the governmen takes frequent measures to cope with the haze, its results are not effective and the air pollution is still continuing to worsening.

Liu Song, a member of the China Photographers' Association, tries to tell us in his photographic work - Things of a stream of smoke, that industrial pollution is indeed terrible, but what's more important is that every one of us should have environment protection in our hearts.