This book examines the dispersion, modeling and simulation of air pollution for flare systems. It employs the use of Eulerian model in predicting the concentration of the gas flared at different point and time from a flare site. A numerical solution method based on the explicit finite difference scheme was used to solve the transient partial equation (model). Validation of the use of different numerical techniques in predicting air concentration profiles and the photochemical reactions involving emitted pollutants in the atmosphere around the flare sites was carried out.