The noise pollution reached a high decibel level 噪音污染达到了很高分贝
Based on the principle of diminishing sound level and its impact factors of indoor sound barriers, to design a scheme for treating noise pollution in group blower, and introduce a design of fixed and activating barriers, and then calculate the noise level being diminished. 根据室内声屏障的降噪原理及影响因素,设计了集群风机的降噪治理方案,介绍了单元声屏障、活动基座及吸声处理的设计并计算了车间的降噪量。
Using this model on the traffic noise level in the different type roads in Macao, The pollution level of traffic noise is assessed quantitatively. 利用建立的交通噪声预报模式,计算了澳门半岛不同类型道路的交通噪声水平,定量评价了道路交通噪声的污染状况。