Those existing stationary pollution sources that, as a result of the adoption of control measures, achieve actual emissions reduction quantities greater than designated reduction quantities may bank, offset or trade the difference after authorization by the local competent authority. 既存之固定污染源因实行防制措施致实际削减量较指定为多者,其差额经当地主管机关认可后,得保留、抵换或交易。