University of Ioannina, Department of Physics, Laboratory of Meteorology, GR-45110 Ioannina, Greece.
National Observatory of Athens, Institute of Environmental Research and Sustainable Development, I. Metaxa & V. Pavlou, P. Penteli, GR-15236 Athens, Greece.
Sci Total Environ. 2014 Jun 1;482-483:493-500. doi: 10.1016/j.scitotenv.2013.09.010. Epub 2013 Sep 27.
This study presents and evaluates noise levels recorded at 15 school complexes in order to describe the indoor as well as the outdoor acoustic environment of schools and gain insight on controlling factors. Noise levels at the roadside in front of the school, the schoolyard, and 41 classrooms, both occupied and unoccupied, were simultaneously and continuously recorded through the course of a daily timetable (08:20-13:10). The average speech noise level of teachers was separately measured for 1min periods. Indoor noise levels, in all cases, were much higher than internationally recommended values: LAeq,5min averaged 69.0dB in occupied classrooms, and 47.1dB in unoccupied ones. Average speech-to-noise ratio (SNR) was estimated to be 12.0dB(A) during teaching, whereas both indoor and outdoor noise levels were significantly elevated during break time and outdoor physical-educational activities. Corresponding measurements of indoor and outdoor noise suggest that noise from the outside (road and schoolyard) affects the background noise level in the classrooms, however in varying degrees, depending on the specific layout and road traffic characteristics. Using double glazing diminishes this effect.
本研究记录了 15 所学校建筑群的噪声水平，以描述学校的室内和室外声学环境，并深入了解控制因素。通过日常时间表（08:20-13:10），同时连续记录学校前路边、校园和 41 间教室（包括使用中和未使用中的教室）的噪声水平。教师的平均语音噪声水平分别进行了 1 分钟的测量。在所有情况下，室内噪声水平都远高于国际推荐值：使用中的教室的等效连续声级（LAeq,5min）平均为 69.0dB，未使用中的教室为 47.1dB。在教学期间，平均语音噪声比（SNR）估计为 12.0dB(A)，而课间休息和室外体育活动期间，室内和室外噪声水平均显著升高。室内和室外噪声的相应测量表明，来自外部（道路和校园）的噪声会影响教室的背景噪声水平，但影响程度因具体布局和道路交通特点而异。使用双层玻璃窗可以减轻这种影响。
