Noise pollution, also known as sound pollution, is the propagation of noise or sound that has harmful effects on human or animal life. It is considered to be any unwanted or disturbing sound that affects the health and well-being of humans and other organisms. Noise pollution can be caused by various sources, including machines, transport, and propagation systems. Poor urban planning may also give rise to noise disintegration or pollution, and side-by-side industrial and residential buildings can result in noise pollution in residential areas.

Noise pollution affects both health and behavior. Unwanted sound (noise) can damage physiological health and is associated with several health conditions, including cardiovascular disorders, hypertension, high stress levels, tinnitus, hearing loss, sleep disturbances, and other harmful and disturbing effects. Exposure to excessive noise can also raise blood pressure and pulse rates, cause irritability, anxiety, and mental fatigue, and interfere with sleep, recreation, and personal communication. Noise pollution can have negative effects on adults and children on the autistic spectrum, who may have hyperacusis, an abnormal sensitivity to sound.

To combat noise pollution, individuals can take many steps to protect themselves from the harmful effects of noise pollution. For example, if people must be around loud sounds, they can protect their ears with hearing protection (e.g., earplugs or earmuffs). Noise-control ordinances and laws enacted at the local, regional, and national levels can be effective in mitigating the adverse effects of noise pollution. International bodies like the World Health Organization agree that awareness of noise pollution is important.