Based on deep analysis of technological data of the sinter plant and experiments, the chlorine input in the sinter mix was identified as the main factor influencing the dust precipitation efficiency in ESP. On the basis of this perception two different ways of emission control where successfully worked out and realized: first, the control of chlorine input with the charge, second, the selective filter dust removal. The annual average of dust content in clean gas was reduced from 49.7 mg/m3 (2004) to 24.6 mg/m3 (STP) (2006). In parallel this measures lead to a reduction of Dioxin emission level < 1 ng/m3 pt (STP).