Eight out of 10 teachers are thought to be suffering from vocal strain or other throat problems because of having to speak loudly or shout to make themselves heard, compared with just five per cent of people working in other professions.
And pupil performance may be adversely affected by students not being able to hear instructions or what is being taught.
It is estimated that at eight metres away from the teacher, pupils understand only
36 per cent of what is said in the classroom.
Also, a 10 per cent rise in background noise on a regular basis has been found to cause a seven per cent drop in SAT scores at primary school.
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