To investigate automobile exhaust gas pollutant status of underground garage in city, two hotels of Jingan district were selected as investigated object and a underground hall as the control to study exhaust gas pollution level.

• 以上海市静安区两个宾馆的地下车库为研究对象,并以该区某地下会堂为对照,调查了地下车库中废气污染状况。