Front edge of polluted by chemicals zone is 80 kilometers from Habarovsk at present moment. As press-service of Emergency Ministry regional center informed, maximum concentration of nitrobenzene was registered near Nizhneleninskoe village at right side of Amur river yeasterday and amounted to 0.181 mg/liter. This amount corresponds to 0.91 of maximum allowable concentration by Russian standards. "On morning of December 19, concentration of nitrobenzene started to reduce and by 02:00 a.m. (Moscow time in December 20) was 0.055 mg/liter, which is 0.28 of maximum allowable concentration", - noted in regional center of Emergency Ministry. Front edge of polluted zone will reach Habarovsk by morning of December 21. For last day 63 water tests were made in Amur. Water is analyzed every 3 hours with express-method, liquid and gas chromatographs. Meanwhile Chinese workers continue construction of dam near Kazakevichev channel in order to prevent pollution of water in water-supply point in southern region of Habarovsk. By information of Habarovsky krai administration, production of mineral and drinking water increases by 5-10% every day. From November 29 by December 18, 584.9 thousands liters of water have been produced. 76.5 thousands liters of water have been delivered to medical and educational institutions of Habarovsky krai.