我们为什么需要空气净化器？ Why do we need air purifiers? 很多人在遇上雾霾天的时候才会想起空气净化器，还有些人可能觉得自己所在的城市雾霾天不是特别严重，所以认为没有必要买。 Many people are in fog day will think of air purifier, also some people may think that their city haze days not very serious, so that there is no need to buy. 但这都是过去一些商家的宣传给你造成的误解。 But this is a misunderstanding that some merchants of the past have created. 空气净化器是在室内用的产品，它改善的是室内的空气，跟室外是否雾霾并没有太大关系。 The air purifier is an indoor product that improves indoor air and doesn't have much to do with the smog. 而唯一的联系仅在于：由于外面雾霾严重，无法通过开窗来透气，所以空气净化器成了你的解决方案。 The only link is that the air purifier is your solution because the smog is so bad that you can't breathe through Windows.