Nosy

The 'Nosy' minimalist breathing device is a reimagined wearable air purifier that works in a nearly noninvasive manner to filter out pollutants in urban areas. The wearable air purifier has a nose-only design that can be comfortably fitted over the nose to filter more than 90% of the air the wearer breathes, while also keeping them far more comfortable compared to full-sized masks. The device will deliver up to 10 hours of air filtration per charge to ensure it will last throughout an entire day or, in many instances, multiple days depending on the amount of time spent outdoors.
Source