On the last August 19, 2015, the Faculty of Economics organized the 2nd Big Cleaning Day Activities under the Assessment of the Excellent Green Office Project to enable the faculty members, supporting staff, and students of the faculty to realize the importance of such activities by working cooperatively to perform them. Their conducted activities were as follows: They cooperatively cleaned the common areas surrounding the Yanyong Sitthichai Building, the faculty of economics, and jointly cleaned the common and private areas in the responsible and related areas.