In the classroom, decibel levels can gradually increase without us realizing it, until they begin to affect the atmosphere: more difficult communication, nervous irritation, reduced concentration, etc ...

The World Health Organization recommends classroom sound levels of no more than 35 decibels. The average volume of a classroom, however, rings in at more than twice that level. At 77 decibels, the ...

You may have observed that older people have more difficulty following a conversation in a noisy environment. Most people attribute this problem to being deaf. However, many of these people are not ...