How to choose an air purifier in a hotel room?

Among the performance indicators of air purifiers, particulate matter and formaldehyde CADR are the most important, followed by ccm, noise, applicable area and volume. The greater the CADR value, the better the purification speed and effect. The higher the ccm, the longer the filter life, the lower the noise, the more comfortable it is, the larger the applicable area, the larger the purification range and the smaller the volume, which can adapt to various rooms.