Freshly generated aerosols in workplace atmosphere may have charges well above the Boltzmann equilibrium (Forsyth et al. 1998). Similarly, aerosols produced by commercial metered dose inhalers can produce elementary charges up to several ten thousands (Kwok et al. 2005). In-vivo and in-vitro experiments have shown enhanced deposition in the lung due to electro-statically charged particles. Enhanced deposition due to charged particles in the lung is mainly caused by the image charge force (Yu, 1985). Several models have been developed to predict the effect of charged particles deposition in the lung with good agreement with the experimental data (Melandri et al. 1983; Yu 1985; Hashish et al. 1994). In the present study, enhanced deposition in the human lung due to charged particles has been estimated using the stochastic airway generation model IDEAL.