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Railways and subways are sources of environmental noise.
Road traffic is a major source of environmental noise.
Environmental noise causes annoyance, which can impact concentration, increase aggressive behavior, and decrease helping behavior.
Environmental noise is a risk for hearing impairment.
Long term exposure to environmental noise can cause sleep disturbances. Uninterrupted sleep is known to be a prerequisite for good physiological and mental functioning of healthy persons.
Exposure to environmental noise is associated with delays in learning for children.
Noise exposure has an effect on stress, hypertension, blood pressure, and heart disease.