Introduction: Nowadays, we spend about 90% of our time inside, where we are exposed to various unnatural sounds. Noise is each unwanted sound which has a negative impact on our feeling and health and has an adverse effect on the environment. Purpose: To obtain data about the levels of noise that the employees at the primary school concerned are exposed to. Methods of work: The focus was on the employees while children were not the subject of the research. The thesis is divided in six parts: self-assessment of noise by employees (questions about the exposure and health issues resulting from the exposure to noise), a comprehensive assessment of the condition of the building and its surroundings (examination of the surrounding of the building, the size and orientation of rooms, interior equipment layout and materials), measuring the noise (in accordance with SIST ISO 9612:2009, measuring instrument Brüel & Kjær 2260 Investigator. Measurements were done on Monday, Wednesday and Friday, in classrooms, lobby, gym, dining room and changing rooms. The following were measured: equivalent noise level, peak noise level and estimated noise level with impulsive correction - LAI,Te), installing an electronic ear (installing in the dining room for a trial period of time), review of efficiency of an electronic ear and corrective measures (organisational, teaching and construction and technical measures). Results: Examination of the surrounding of the school showed that it does not affect the noise inside. Analysis of the premises showed that the prevailing materials are wood, concrete and bricks, while the inventory of equipment included metal and wood (all the materials used bounce rather than absorb noise). The noisiest day in the week was Monday. The highest LAI,Te (average 87.67 dB) were recorded in the school lobby, which exceeds the limit value of 87 dB. The upper exposure value of 85 dB is exceeded in the dining room during breakfast and lunch (86 dB). The bottom exposure value of 80 dB is exceeded in the changing room (82.9 dB). Use of an electronic ear and an organisational measure implemented resulted in a substantially decreased noise in the dining room. Discussion and conclusion: A simple form for a comprehensive assessment of the condition of the building and a list of the most common corrective measures have been prepared, which can be applied by all primary schools which have problems with noise, mainly with the health of the users of the building and consequently with carrying out the educational activity.
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