The air is filled with pollutants that pose a risk to your health Full-room purification in the time it takes to read a bedtime story Xiaomi Smart Air Purifier 4 Pro has a CADR of up to 500m³/h, and is able to release 8330L* of clean air per minute. The purified air is able to reach every corner of your home, so you and your family can breathe healthy all the time. Clean air that is visible with comprehensive monitoring and real-time display Targeted purification that leaves pollutants with nowhere to hide Comprehensive monitoring of air-quality changes for more targeted, efficient purification. In Auto Mode your purifier monitors real-time air quality and automatically adjusts the purification speed. PM2.5-PM10 Detection of coarse particles such as pollen Indoor monitoring for pollen, ash, spores, pet dander and plant epidermis etc PM2.5 Detection of fine particles Indoor monitoring for small inhalable pollutants, such as invisible particles in smoke etc Intuitive display, easy-to-control interface Intuitive indoor air-quality data with the real-time PM2.5/PM10 display and colour-coded light strip. Adjust your purification settings with the simple touch control buttons, one light touch to fulfil your air-quality needs. Just one filter for up to one year's usage Everyday freshness with a long-lasting filter The filter, made from large-area high-efficiency filter and large volume high-quality activated carbon, can last 6-12 months. No need for frequent filter replacement.