In order to study the effective methods of controlling the emission of pollutants from multiple pollution sources.The CFD technology was used to simulate the effect that integrated exhaust hood and the individual exhaust hood control the harmful gases under the same conditions when multip-pollution sources emit harmful substances simultaneously.The results show that the flow direction of integrated exhaust hood is more favorable for workers to breathe fresh air than that of individual exhaust hood.It found that the control effect of both sides of the independent exhaust hood and the integrated...