A A company called Dyson has made an air purifier(净化器)for the home.The new air purifier is called the Pure Cool Link. The new air purifier can catch up to 99.95 percent of pollutants in the home. Follutants are the things like dust, pollen(花粉)and smoke. The air purifier needs one hour to clean the air in a room. It checks the air quality to keep it at safe levels, It is good for people who have diseases such as allergies or asthma. The air purifier can be controled by an app. Users can install the app on their mobile phones. They can control it easily anywhere. Pollution is not just a danger outside the home. James Dyson,the founder of the Dyson company, said,“We know the air outside our homes is pollutes, but the air inside can be even worse." Modern homes do not let air or noise in or out. This means the pollutants we create inside the home are trapped. They can be up to five times the pollution levels they are outside the home. The new air purifier is not cheap. It will cost between $ 500 and $ 650.