A pool perimeter assembly extending along a portion of a pool perimeter includes a combined gutter assembly having a gutter conduit and a grate supported above the gutter conduit. The combined gutter assembly also has a partition dividing the gutter conduit to form an exhaust air plenum on one side of the partition. A surge tank is fluidly connected to through a modified converter box and a water-air line to the exhaust air plenum. An exhaust fan is connected to the surge tank and generates below atmospheric pressure so that the contaminated air on the pool surface is drawn through the grate and into the exhaust air plenum, through the water-air line, into the surge tank, and of the surge tank through the exhaust fan.