The rapid increase in the number of automobiles has led to significant environmental problems, particularly car exhaust pollution. Vehicle exhaust emissions are a major contributor to environmental issues such as smog, ozone depletion, acid rain, as well as serious respiratory diseases and carcinogens. The environmental problems caused by the growing number of automobiles cannot be addressed solely by the natural self-purification capability. Titanium dioxide (TiO2) is widely used in research on road materials for reducing vehicle emissions due to its excellent corrosion resistance, strong catalytic properties, simple preparation process, low cost, and stable chemical properties. This study focuses on asphalt pavement materials, conducting experiments on the preparation of permeable asphalt mixtures coated with photocatalytic materials, the degradation performance of nano TiO2 photocatalytic materials on exhaust gases, and the overall performance of coating with nano TiO2 photocatalytic materials. The research aims to catalytically degrade automobile exhaust gases through asphalt pavement, reducing the health risks associated with vehicle emissions.