Today, clean air seems routine for residents in North China's Beijing-Tianjin-Hebei area. But if you had traveled back a few years ago, you would have seen a rather different scene.

In early 2013, extended heavy smog shrouded the skies of Beijing and its surrounding areas, leaving tens of millions of people choking.

Facing lasting air pollution, Chinese Peasants and Workers Democratic Party, one of China's eight non-communist parties, proposed to form a national-level coordinated network to tackle the problem.

Let's see how the proposal helped initiate a massive campaign against air pollution.

Proofreader: Jocelyn Eikenburg

Script writer: Ma Chi

Host: Li Danqing

Editors: Zhang Chunyan, Wang Jianfen