Abstract: A pollution control system to control pollutants in water surrounding a drydock includes a housing extending from each end of the drydock wing walls about the perimeter of the drydock so as to completely encircle an inboard deck of the drydock. The drydock moves between a floating position to a submerged position upon filling drydock buoyancy tanks with water. The housing includes a slot to allow positioning of a removable screen in an opening in the top of the housing. The screens allow the water to flow to and from the deck, as the deck moves between the floating position and the submerged position. A baffle plate is positioned inboard of the housing on the drydock deck to inhibit movement of pollutants between the baffle plate and the housing. Advantageously, a process for reducing pollutants in water surrounding a drydock includes removal of the screen from the housing to protect it from ultraviolet effects or from welding operations during maintenance and repair of a drydocked vessel.