‘噪音’ (zàoyīn) literally combines ‘噪’ (zào), meaning ‘noisy’ or ‘raucous’, and ‘音’ (yīn), meaning ‘sound’. Together, it refers specifically to unwanted, disturbing, or harmful sound — especially environmental or industrial noise like traffic, construction, or machinery. Unlike the neutral term ‘声音’ (shēngyīn, ‘sound’), ‘噪音’ carries a negative connotation: it implies interference, discomfort, or potential harm to hearing or well-being.

This word is commonly used in public health, urban planning, and environmental contexts. You’ll see it on signs warning about loud areas (e.g., ‘请勿制造噪音’), in news reports about city noise pollution, or in medical discussions about hearing loss. It’s rarely used for pleasant or intentional sounds — even loud music isn’t called ‘噪音’ unless it’s intrusive or uninvited. The term emphasizes subjective disturbance rather than just decibel level, making it socially and contextually sensitive.