为了使采样在空间距离上有一个对比，于2009年9月1日在龙潭寺西路附近某公司的顶楼雨棚下设置了2号采样点，距地面高度约15m。
In order to compare the samples in space , we set up the 2nd sampling point , from the floor height of about 15m , in the vicinity of the top floor of a company near West Longtan Temple Road on September 1 , 2009 .
龙潭寺