Which filter is suitable for replacement?

Air purifiers mainly filter and intercept pollutants, thereby purifying the air. The pore size and air permeability of the filter are closely related to its purification effect. Most filters can only intercept larger particles, and have very limited effects on certain fine particles. Therefore, when replacing the filter, we should according to our own situation. If there is haze, the main hazard is PM2.5, so when choosing a filter, pay attention to PM2.5.