A mercury manometer (ρ = 13 600 kg/m^{3}) is connected to an air duct. One arm is joined to the duct and the other arm is open to the atmosphere; the mercury in the open arm stands 30 mm higher than in the arm connected to the duct. The atmospheric pressure is 100 kPa. State whether the duct pressure is above or below atmospheric, and determine the absolute pressure in the duct (answer in kPa).