SOUND POLLUTION
* Sound pollution is a serious problem like air, water pollution. It is harm full to human beings. *W express the loudness of the sound in decibels (dB) ,which we have already learned. * The sound in our normal conversation is about 60db. * If the loudness exceeds 80db,the sound becomes physically painful. *If a person is being exposed to the sound of 80db continuosly it may lead to hearing problems.