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Una de las agresiones más graves que originan las ciudades es la contaminación acústica generado por la actividad humana. El ruido, aunque menos alarmante que la contaminación atmosférica, provoca molestias e incluso patologías cuando supera un nivel determinado. La principal fuente de ruido en las ciudades es el tráfico rodado, por encima del que generan la industria o las actividades en la vía pública...
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