There is HEPA filter in the dust compartment of the Xiaomi Robot Vacuum X20+, which is a type of mechanical air filter designed to trap very small particles with high efficiency.
Here are more details about HEPA filter:
1. HEPA filter can remove 99.97% of particles as small as 0.3 microns, including dust, pollen, mold, bacteria, and some viruses;
2. HEPA filters use three primary mechanisms to capture particles, interception, impaction and diffusion;
3. HEPA filters will improve air quality through removing allergens, pollutants, and irritants, making the air cleaner and healthier to breathe;
4. HEPA filters operates without the use of chemicals or other potentially harmful substances.