In China there are about 10.4 millions motor vehicles and 13.0 millions of motorcycles in use. The growth of vehicle parc has increasingly caused serious traffic noise harmful to environment. In most of urban area the...In China there are about 10.4 millions motor vehicles and 13.0 millions of motorcycles in use. The growth of vehicle parc has increasingly caused serious traffic noise harmful to environment. In most of urban area the noise level (L<sub>50</sub>) along sides of main streets usually exceeds 70 dB（A） or 75 dB（A） during daytime, which has aroused much attention of the Chinese government.展开更多
文摘In China there are about 10.4 millions motor vehicles and 13.0 millions of motorcycles in use. The growth of vehicle parc has increasingly caused serious traffic noise harmful to environment. In most of urban area the noise level (L<sub>50</sub>) along sides of main streets usually exceeds 70 dB（A） or 75 dB（A） during daytime, which has aroused much attention of the Chinese government.
