Every day, millions of students go to school to learn, but unfortunately many children are affected by poor indoor air quality and high noise levels. According to the Acoustical Society of America, U.S. classrooms typically have a speech intelligibility rating of about 75%. That means every fourth word is missed. This does not only affect the student’s possibility to learn, but also for the teachers as they must speak louder. It is also found that 50% of teachers suffer from irreparable damage to their voices, which is due to them speaking too loudly to be heard. Research shows that investments in good acoustics and indoor air quality throughout schools can have a life-changing impact.