空气净化器除甲醛，主要依靠滤网中的活性炭成分进行甲醛的分解。除甲醛原理和活性炭一样，因此滤芯寿命就是最大的问题，一旦吸附满了将不再吸附且会二次释放，需要定期更换滤芯。另外，当气体污染物的浓度很高的时候，净化的效果也随之大打折扣。

In addition to formaldehyde, the air purifier mainly relies on the active carbon components in the filter to decompose formaldehyde. In addition to the principle of formaldehyde and activated carbon, the life of filter element is the biggest problem. Once the adsorption is full, it will no longer adsorb and release for two times, so it is necessary to replace the filter element regularly. In addition, when the concentration of gas pollutants is very high, the effect of purification is also discounted.