Abstract: To mitigate the emission and dispersion of pollutants in the road environment during both the construction and operational phases of asphalt pavements, and to achieve long-term, high-quality, self-cleaning capabilities, a composite cleaning modifier was synthesized based on the regulation of tourmaline and porous materials, and an efficient smoke suppression and gas purification modified asphalt mixture was prepared using this modifier. Based on rutting test, low-temperature bending test, immersion Marshall test, freeze-thaw splitting test, and four point bending fatigue life test, the road performances of modified asphalt mixture were comprehensively evaluated. Based on the test method of asphalt mixture smoke emission reduction efficacy, we compared and analysed the emission pattern of modified asphalt mixtures in the construction period and the operation period, and explored the effectiveness of smoke emission reduction in the construction period and the operation period. Based on the test method of vehicle exhaust purification efficacy, it reveals the variation rule of the concentration of various pollutant components of vehicle exhaust under different atmospheric temperatures and emission heights, and clarifies the exhaust purification efficacy of modified asphalt mixtures. Based on the principles of charge transfer and infrared radiation, the synergistic enhancement mechanism of the material's environmental efficacy was clarified. This understanding facilitated the effective and balanced removal of pollutants from asphalt pavement environments. The results indicate that, compared to the common asphalt mixture, the smoke-suppressing and air-purifying modified asphalt mixture demonstrates significant improvements in both pavement and fatigue performance, with enhancements ranging from 10% to 20%. At an optimal modifier content of 20%, the modified asphalt mixture demonstrated a reduction rate exceeding 61% for all major pollutant components in flue gas emissions during the construction phase, with the highest reduction rate of 71.59% observed for PM10. During the operational phase, the reduction rate for all pollutant components exceeded 58%, with NO_x exhibiting the highest reduction rate of 63.71%. The purification efficiency of the modified asphalt mixture for vehicle exhaust decreased with increasing emission height but improved with rising temperature, with all component purification rates surpassing 44%. Notably, NO_x achieved the highest purification and reduction rate of 66.60%.