Abstract: Exhaust pollutants of a vehicle are reduced by providing dry, substantilly moisture-free air which is mixed with the fuel. The conventional air filter is removed and replaced by a housing containing a plurality of sealed glass tubes having inert gas therein which treats the air by subjecting it to ultraviolet rays and additional heat. The air has been initially heated to remove the moisture and subjected to an ultraviolet treatment before it reaches the housing.

Abstract: An air/fuel mixture heating device for an internal combustion engine comprises a riser portion located at a relatively high position in the riser space in an intake manifold and having air/fuel mixture heating means and a barrier formed on a circumference of a riser surface of the riser portion, and an intake air inlet arranged in opposition to the riser surface for introducing intake air to the riser surface, thereby promoting the atomization of fuel particles by heating by the riser surface and by causing the fuel to pass by the barrier to distribute the fuel uniformly to respective cylinders of the engine.