At present, the air purifiers sold in the market are mixed, so consumers should consider the purification method, purification technology, filter screen, airflow design, humidification function and so on. In addition, more and more health experts advocate the use of air purifiers to prevent the breeding of harmful substances in the air, purify the air and achieve the purpose of health preservation. Whether the air purifier can maintain health depends on whether the purifier increases the content of negative oxygen ions in the air and whether it incorporates natural fenduojing, which are unique beneficial components in natural forests. At present, there are also air purifier manufacturers in China who add negative oxygen ions and fenduojing release systems to the purifier to increase the beneficial components in the air.