Effects of traffic noise on pupils'behavior in classroom

Noise surveys in this country reported that a large number of classrooms in primary and secondary schools in the urban area were disturbed by the environmental noise,particularly by the traffic noise.A series of psychological tests were conducted to identify pupils'behavior in a classroom under different noise levels within the range of 40 to 70 dBA.Statistical analysis was made by using a Relational Data Analysis System (RDAS) software.According to the t-test and single factor variance analysis of the results,significant differences of pupils'behavior in classrooms have been observed when the percentile erceeded ound level either L₅₀ exceeds 50 dBA or L₁₀ exceeds 55 dBA,or the equivalent continous sound level L_eq exceeds 50 dBA.The same conclusion has been drawn from the average percentages of syllable articulation tests made in accordance with the procedure described in the National Standard under different noise levels in a classroom.The maximum acceptable noise level in the classroom thus can be determined.