Mathematical models for describing the removal of dense nonaqueous phase liquid (DNAPL) droplets dispersed in a contaminated aquifer by air sparging are described. The sparging configurations considered are 1) a single air pipe discharging at the bottom of the aquifer and 2) a single horizontal slotted pipe discharging at the bottom of the aquifer. Diffusion transport of VOC is assumed to take place from spherical DNAPL droplets through a thick stagnant water layer in a porous medium to the moving aqueous phase. The dependence of removal rates on model parameters is explored.