Odor problem is everywhere in the factories, roads, food markets, or toilets... It always make worker or user feel uncomfortable and disgusting. Even worse, hurt our body. Odor is a compound of organic molecular. It has the characters of small, uncertain, and difficult to define. Although the smell can be diverse from different people’s consciousness. Still, some of the smell like ammonia, toluene, or acetone is common and harmful. The nasal filter can solve this problem by purifying the odor in the air, so that everyone can still breathe fresh air in a difficult environment. We aim to design the most light, small, effective and environmental friendly product.