Abstract: An air pollution prevention device that is designed in the preferred embodiment to operate downstream from an existing muffler. The device comprises an oil filled lower chamber with turbulence causing means such as plastic netting through which the exhaust gasses pass. Two upper chambers having turbulence causing means such as steel wool receive the gasses and oil from the lower chamber. The particulate matter in the gasses is coated with oil and being heavier than the exhaust gas will drop out of the exhaust gas and run into the lower oil chamber where it can be periodically removed along with the oil when clean oil is added to the device.