Personal Wearable Air Purifier Necklace Mini Portable Air Freshener Ionizer Negative Ion Generator Car Home Dual Air PurifiersDescription: Portable air purifier In addition to formaldehyde PM2. 5 negative ion air purifier Negative ions will adsorb suspended particles in the air (such as PM2. 5, formaldehyde, pollen, second hand smoke, pet hair, etc.), make these suspended particles attract each other, become larger and heavier, and accelerate landing. The purifier continuously uses 3 million CM3 negative ion mouth and nose, like forming an invisible mask, which can