NOISE AND RESPONSE IN CLASSROOM OF PRIMARY AND SECONDARY SCHOOLS
中小学教室内噪声和师生反应的调查

Noise survey at primary and secondary schools in the cities of Shanghai and Nanjing revealed that trafficnoise is the most common and severe noise source intruding into the classroom. A recommended acceptable noise level can be determined from the teacheras response to the noise under investigation. Meanwhile, considering the teacher as speaker in an ordinary classroom, a similar acceptable noise level can also be determined from syllable articulation tests. As to the pupil, a series of psych-physical tests for pupil's behavior in the classroom have been conducted under different traffic noise levels at the range of 40 to 70 dBA. According to the results of t-test and single factor variance analysis, both significant differences between various articulation scores and the pupils' behavior in the classroom have been observed when the percentile exceeded sound levels either L50 exceeds 50 dBA or L10 exceeds 55 dBA.Conclusions drawn from these results strongly support the recommendation which we have made in our previous papers.