If you use public transportation, you know just how gross the air can be. Commuters are constantly coughing and sneezing, which releases thousands of germs into the air. Taking a flight can be even worse, thanks to the recycled air. And that's not to mention pollution-filled cities like Wuhan in China, or even Los Angeles. Wearing a face mask can help prevent you from breathing in those germs and pollutants, but they're not very effective, and they're not exactly socially acceptable. Air purifiers that hang around your neck are subtler, but they're even less beneficial. Dyson's patent for a new type of purifier describes a product that merges an air purification system with a set of headphones for an effective but somewhat subtle solution to staying healthy in germ- or pollution-filled settings.