Air purifiers play a crucial role in improving indoor air quality. Their main function is to remove various air pollutants, including PM2.5, dust, pollen, odors, formaldehyde and other decorative pollutants, bacteria, allergens, and even viruses. This process effectively enhances the cleanliness of the air within a given space.

Air purifiers can be classified into several types, such as active purification air purifiers, passive purification air purifiers, and composite air purifiers. Active purification air purifiers emit purifying and sterilizing factors into the air, actively capturing microparticles, bacteria, and impurities. They are especially effective in purifying small particles and can distribute throughout the air to purify indoor spaces. On the other hand, passive purification air purifiers draw indoor air into the machine through a fan and filter out dust, particles, and other substances using built-in filters, also eliminating unpleasant odors.

Moreover, air purifiers often come with performance indicators such as CADR (Clean Air Delivery Rate), which measures the amount of clean air provided by the purifier per hour, and CCM (Cumulative Cleaning Mass), which represents the purifier's continuous purification capacity or the lifespan of its filter. These indicators help users understand the efficiency and durability of the air purifier.

In summary, air purifiers are essential devices that help create a healthier and more comfortable indoor environment by removing harmful air pollutants and improving air quality.