In more advanced devices, like the Levoit Vital 200S, this is a three-stage filtration system. First, there's a pre-filter—a washable mesh that handles larger debris like visible dust and hair. Then comes the main filter, a dense HEPA filter, that captures what you can’t see: tiny particles as small as 0.3 microns, including pollen, bacteria, and vehicle pollution. Finally, there's a layer of activated carbon that neutralizes kitchen smells, smoke, and volatile gases. In the case of the Vital 200S, there’s also an infrared sensor that detects air quality in real-time and adjusts the power level accordingly.
