Noise pollution means unwanted or harmful sound. This definition matters because it separates normal sound from sound that causes harm. For example, music at a normal level in a private room may be acceptable. The same music played at high volume late at night beside houses can become a community noise issue. Road traffic during the day may be expected in commercial areas. The same level beside a hospital, school, or residential area can be harmful because people in those places need quiet for rest, recovery, or learning. Noise pollution also has different forms. Environmental noise comes from outdoor sources such as roads, railways, aircraft, construction sites, and industrial areas. Occupational noise affects workers in factories, construction sites, traffic enforcement, transport, and other noisy jobs. Community noise comes from daily activities such as loud speakers, modified vehicle exhausts, generators, alarms, and neighborhood events. The important idea is that noise is not only about personal irritation. It affects public health, land-use planning, workplace safety, and community welfare. This is why standards do not only ask if a sound is annoying. They ask where it happens, how loud it is, how long it lasts, and who receives it.
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