Air

Air is a concept project that monitors air quality in the train. The idea came out one day when I was taking the train during the rush hour. There are various smells in the crowded coach, especially in summer.

The device would warn me what's composition of air surround you. Too much CO2 in a close train would choke you; people fart in front of you, and you don't hear the sound but smell, or you are standing in front of someone might have bad breath.