NOVELTY - The apparatus (30) comprises an electrolysis cell (50) for storing aqueous solution, which is electrically connected to a battery (12), and an outlet (124) for directing effluent gas flow from the electrolysis cell. A scrubber (122) removes contaminants from the effluent gas flow, using a scrubbing medium. The scrubber comprises a scrubbing nozzle for creating intimate contact between flow of the scrubbing medium and effluent gas.    USE - Hydrogen generating apparatus for producing hydrogen and/or oxygen used as fuel or fuel additives in vehicle such as diesel tractor-trailer. Uses include but are not limited to passenger automobile, heavy equipment, bus, locomotive, marine engine, military vehicle, aircraft, spacecraft, power generation turbine, stationary generators, etc.    ADVANTAGE - The generation of hydrogen generation for improving internal combustion of fuel can be performed efficiently, without releasing caustic chemicals such as potassium hydroxide, so that environmental pollution can be prevented. The maintenance of the hydrogen generating apparatus can be performed easily by using a simple arrangement.    DETAILED DESCRIPTION - The apparatus comprises an electrolysis cell for storing aqueous solution, which is electrically connected to a battery, and an outlet for directing effluent gas flow from the electrolysis cell. The apparatus comprises an electrolyte recycle conduit (126) for delivering the scrubbing medium to the electrolysis cell. The flow of the scrubbing medium is sprayed into the flow of the effluent gas. The direction of flow of the scrubbing medium is perpendicular to the direction of flow of the effluent gas. A pair of mesh electrodes is arranged within the electrolysis cell and electrically connected to the battery. An ion exchange membrane coated with nickel, platinum, titanium and its alloys is arranged between the mesh electrodes and immersed within the aqueous solution. The aqueous solution is refilled into the electrolysis cell through an inlet, and effluent gases are directed from the electrolysis cell to the engine through an outlet. The aqueous solution is filled in the electrolysis cell, to a predetermined refill level, for enabling the electrolysis cell to operate for a minimum operating period. An INDEPENDENT CLAIM is included for method for generating hydrogen, which involves delivering electricity to an electrolysis cell that is electrically connected to a battery, so that hydrogen and oxygen is generated by electrolysis of an aqueous solution contained within the electrolysis cell. The effluent gas flow is directed from the electrolysis cell, and contaminants are scrubbed from the effluent gas flow with a scrubbing medium. The effluent gas flow is introduced into an internal combustion engine. The generated oxygen is directed from the electrolysis cell and introduced into the internal combustion engine.    DESCRIPTION OF DRAWING(S) - The drawing shows a plan view of the hydrogen generating apparatus.    Battery (12)    Hydrogen generating apparatus (30)    Electrolysis cell (50)    Scrubber (122)    Outlet (124)    Electrolyte recycle conduit (126)