Laminar air flow in a two-dimensional stagnation point flow is numerically simulated. This geometry resemble the flow of air in clean room over a clean bench. The Lagrangian equation of motion of aerosol particle that includes effects of drag, gravity, lift force, Brownian motion and electrostatic force is solved numerically. The Brownian force is simulated as a Gaussian white noise random process. Trajectories of aerosol particles in the flow are evaluated and a deposition capture area which varies with particle sizes is produced. The effects of particle diameter and surface voltage on particle capture area (deposition area) are shown. Different surface voltages of 0.0, 1.0, and 4.0 kv/cm are considered. The results show that, deposition of particles increases as the surface voltage increases for all particle sizes considered. Also, the particles which have a minimum capture area are in the range of 0.50–1.0 μm. This implies that the particles which have a minimum deposition rate are in that range.