Some school staff may be exposed to enough noise to cause hearing loss. Those at risk include physical education, shop, and music teachers; custodial and food service workers; and bus drivers. All school staff may be exposed to enough noise to cause stress and interfere with communication between staff and students. If loud noise sources can be quieted, overall noise in the school is also reduced. For example, soundproofing a music room may benefit the whole school as well as staff and students using the room.
Noise sources from outside schools include highways, trains, aircraft, grounds maintenance, construction activity, and playground and athletic field activity. Noise sources from inside schools include:
Hearing loss Hearing damage can begin at exposures as low as 80 decibels (dBA) over an eight-hour day. Some average sound levels are shown in the sidebar. After working in a noisy environment, staff members may experience temporary hearing loss. Normal hearing returns after some time, depending upon the individual and the severity and length of the exposure.
Permanent hearing loss, on the other hand, may occur from exposure to loud noises for an extended period without protection. A hearing aid or surgery cannot help noise-induced hearing loss. Since hearing loss occurs gradually, individuals may not realize that they have permanently lost some of their hearing until it is too late.
Noise also affects health in other ways. It causes stress and increased blood pressure, and may contribute to heart disease and ulcers. Working in a noisy environment for long periods can make staff tired, nervous, and irritable. Noise in the classroom may decrease staff and student motivation, attention, memory, and thus academic achievement.
Teachers and educational support professionals who must use their voice a lot, especially if they must raise their voice to be heard, suffer a high rate of voice disorders such as hoarseness, discomfort with speaking, and tired, weak, and effortful speech.
Noise inside schools can be reduced by:
Microphone amplification of a teacher’s voice facilitates communication only in one direction and does not eliminate the negative effects of noise exposure.
Healthy School Facility Environments, Noise and Acoustics webpage www.state.nj.us/health/healthy schools/acoustics.shtml Quiet Classrooms website www.quietclassrooms.org Clearinghouse on Educational Facilities, Classroom Acoustics Resource List www.edfacilities.org/rl/acoustics.cfm
The PEOSH Noise Standard, 1910.95
The PEOSH noise standard limits employee exposures to 90 decibels (dBA) averaged over an eight-hour day. No employee may be exposed to noise in excess of 115 dBA without earplugs or muffs that will reduce the exposure below 115 dBA.
The PEOSH Permissible Noise Levels chart shows allowable exposure levels that are equivalent to a 90 dBA eighthour average. For example, someone exposed to 95 dBA of noise could only be exposed for four hours a day.
The standard requires that all areas suspected to be over 85 dBA must be monitored. If noise levels are above 90 dBA, the district must first attempt to use engineering controls to bring noise levels down below 90 dBA before relying on earplugs or muffs.
If employee exposure exceeds 85 dBA averaged over eight hours, the PEOSH standard requires the district to provide annual hearing tests and a choice of free hearing protection. Staff members are entitled to get a copy of the test results, and must be informed of any hearing loss.