在研究噪声对周围居民的影响时,有一个十分重要的问题需要充分注意.这就是噪声在户外的传播规律.许多现象看来是不可思义的,例如住在声源数百公里外的居民听到了几十公里处的居民毫无所闻于爆炸声,和高层居民感受的交通噪声常常会高于低层等等,都需借助户外声传播的规律来加以解释. When studying the impact of noise on surrounding residents, a very important issue needs careful attention, which is the law of the spread of noise outdoors, and many phenomena seem inconceivable, for example, residents living within a few hundred kilometers of a sound source Heard of dozens of kilometers of residents heard nothing of explosions, and high-level residents feel the traffic noise is often higher than the lower and so on, need to use the law of outdoor sound transmission to be explained.