Abstract: An apparatus for controlling and minimizing the production of the noxious exhaust gases from an automobile internal-combustion engine, comprising two passageways extending from an intake manifold provided with a throttle valve therein which is located between the two passage ways, one of the two passageways leading to a first control section provided with a diaphragm therein which is actuated in response to changes in the vacuum from the intake manifold for controlling the supply of water or like and air to the combustion chamber and the other leading to a second control section provided with a diaphragm therein which is actuated in the same manner for controlling the supply of part of the exhaust gases and air to the combustion chamber for reburning them, thereby enabling the supply of water or like, air and exhaust gases to be controlled according to the amount and type of the noxious exhaust gases.