In recent years, wearable computing was more popular. Wearable computing is a device which user can use their own equipment and computer more efficiently and assist them to acquire information from database or sensors. Currently, wearable computing focus on health, such as body sensors which can monitor accurate heartbeat, pulse, and even can count calculate you walking how distance. But not all of them are integrated and connected with computer. This paper will propose wearable computing such smart phone or tablets via wire or wireless connection to connect buildings with Arduino and air sensors. Such sensors are harmful air detecting devices which used statistic to judge and warn human to avoid form danger when they walk into unknown areas and without sufficient information. We describe some background we need. We finished and demonstrate our system.