An air purifier includes a vertically disposed housing (1) provided with a wire gauze filter (14), electric fans (2) and air filter elements (21). The electric fans (2) draw outside air around the floor vertically into the bottom air intake port (11) toward the top air output port (12) of the housing (1) so that the flow of air, when passed out of the air output port (12). flows upwards to a certain elevation and is then diffused and lowered in all directions around the housing (1). By means of the traction of the flow of air. the pressure difference of the convection of air between the low air pressure and the high air pressure at the bottom and top sides of the housing (1), high concentration of car waste gas, micro dust particles, hair dust, micro fibers and other harmful industrial odors that fall to the floor due to the effect of gravity or floating nearly above the floor are sucked into the inside of the housing (1) by the low air pressure zone at the open bottom side of the housing (1) and then removed by the filter elements (21).
