A cloud of exhaust at a coal-fired steel factory in Shanxi Province. At a facility like this, smoke of any color other than white is toxic.
A cloud of exhaust at a coal-fired steel factory in Shanxi Province. At a facility like this, smoke of any color other than white is toxic.
山西省一个钢厂的烟囱正喷出滚滚浓烟。像这样的烟囱，除了白烟以外其他颜色的烟都是有毒的。