By the method of evaluation respiratory function in contaminated areas An Duong village, An Dong commune, An Hai, Hai Phong. Area contaminated downwind Northeast of the factories with 87 objects compared with those of 95 in Dang Hai commune of Hai An - Hai Phong (unpolluted area). The authors found ventilation lung function tends difference was statistically significant with p 0.01 with ventilatory disorders, ventilatory disorders congestion, and ventilatory disorders composite and VC percent index, Tiffeneau reduced.