It filters out toxic particles, pollen, viruses, bacteria and the fine particles found in diesel exhaust.
The front has an extraction valve to let hot air out fast when you're exerting yourself running or cycling.
R-Pur has an app that tracks the wear and tear of the filter. Depending on your use, a filter can last between 5 and 12 weeks.
A representative for R-Pur showed us a new prototype of the Nano mask that lights up in different colors.
As the mask moves through the air, colors reflect the air quality.
For example it might glow green if the air is good, or red if it's bad.
The R-Pur Nano is currently available in Europe for 170 euros, which converts roughly to $200, £150, AU$275. It will be available to order in the US later this year. Extra filters cost 78 euros.