Ible Airvida is the world's lightest neck-mounted air purifier that adsorbs and removes particulate matter in the air (PM2.5, pollen, dust, second-hand smoke from tobacco, etc.). It generates up to about 2 million negative ions / ?.
Personal air filter. Easy to wear, I charge at night and wear all day. I forget that is it is there most of the time. Lightweight, you just turn it on and slip it over your neck. Resembles the around-the-neck type of Bluetooth headphones, so if those annoy you, this may not be good for you. The only reason I gave it 4 stars instead of 5 is it is a bit pricey in my opinion. Product was shipped from Japan and I received it quicker than I anticipated. Not sold in the US directly that I am aware of.