Combining companies 'own reports with estimates based on data about companies seems like an effective two-pronged approach. But with the EPA wielding the stick of its inspection powers, "Firms often conceal data for fear of prosecution, and this makes it very difficult for government surveys to reveal the true figures," says Hsing Haojan, a researcher with the IDB's Coordination Office for Sustainable Industry.
由廠商主動申報，並從廠商的基本資料推估，似乎是雙重保障的好方法，但是環保署站在稽查的立場，手上拿的是棍子，「廠商怕被取締，常常隱瞞數據，因此政府很難調查到真實數據」，工業局永續發展小組研究員邢浩然說。