空气净化器在居家、医疗、工业领域均有应用，居家领域以单机类的家用空气净化器为市场的主流产品。最主要的功能是去除空气中的颗粒物，包括过敏原、室内的PM2.5等，同时还可以解决由于装修或者其他原因导致的室内、地下空间、车内挥发性有机物空气污染问题。由于相对封闭的空间中空气污染物的释放有持久性和不确定性的特点，因此使用空气净化器净化室内空气是国际公认的改善室内空气质量的方法之一。
Air purifier is widely used in home, medical and industrial fields. In the home field, the single type of home air purifier is the mainstream product in the market. The main function is to remove the particles in the air, including allergens, indoor PM2.5, etc., and also to solve the indoor, underground space, vehicle air pollution caused by decoration or other reasons. Because the release of air pollutants in a relatively closed space has the characteristics of permanence and uncertainty, the use of air purifier to purify indoor air is one of the internationally recognized methods to improve indoor air quality.