Noise control engineering is a comprehensive field, primarily encompassing three major aspects: identification and control of noise sources, blocking the pathways of noise propagation, and protection of noise reception points. Specific tasks include noise reduction for industrial equipment, transportation facilities, and construction sites, such as installing mufflers and sound-insulating covers; designing soundproofing and absorbent solutions for noise pathways, such as setting up noise barriers and soundproof walls; and implementing protective measures in sensitive noise areas like residential neighborhoods and schools, such as installing soundproof windows and planting sound-insulating green belts. Additionally, it includes noise monitoring and assessment, as well as the formulation and enforcement of noise standards.