Sneak up on polluters at night, inspector says

Authorities find that surprise is an effective way to reveal true state of factory emissions

With environmental campaigns continuously being carried out by the government to combat air pollution, it is not uncommon to see inspectors being rejected, interfered with and even assaulted by employees of polluting enterprises.

Even so, as of October, about 20,000 companies have been ordered to improve their facilities, according to the Ministry of Ecology and Environment.