Our design is an “air-tree-lamp” integrating LED street lamps with an air filter. First, the solar circuit board in the top of the LED lamps can absorb and store solar energy to provide the whole equipment, including the light and the filter device. Then, there is a fan at the bottom of the lamp, which can push the air through the filter device and get fresh air. Last, the fresh air flow to the room through the pipeline. Besides, the bottom of the lamp is also used as a seat, for relaxing.