噪聲(sheng)(sheng)是發(fa)聲(sheng)(sheng)體(ti)做無(wu)規則振動時發(fa)出的(de)聲(sheng)(sheng)音(yin)，聲(sheng)(sheng)音(yin)由(you)物體(ti)的(de)振動產(chan)(chan)生(sheng)，以(yi)波的(de)形式在一定(ding)的(de)介質(如固(gu)體(ti)、液體(ti)、氣(qi)體(ti))中(zhong)進行傳播通常所說的(de)噪聲(sheng)(sheng)污染是指人為造成(cheng)的(de)。產(chan)(chan)業革命以(yi)來，各種機械設備(bei)的(de)創造和使用，給人類帶來了(le)繁榮和進步(bu)，但同時也(ye)產(chan)(chan)生(sheng)了(le)越(yue)來越(yue)多而(er)且(qie)越(yue)來越(yue)強的(de)噪聲(sheng)(sheng)。

室內(nei)噪聲的(de)主要來源：

1.交通運輸噪聲

城(cheng)(cheng)市(shi)交(jiao)通業日(ri)趨發達，給人們(men)工作和(he)(he)生活帶來了便捷和(he)(he)舒適，同時也促進了經濟的發展。但不(bu)能(neng)不(bu)看到，隨(sui)著城(cheng)(cheng)鄉車(che)輛的增加，公路和(he)(he)鐵路交(jiao)通干(gan)線的增多，機車(che)和(he)(he)機動車(che)輛的噪(zao)聲已成(cheng)了交(jiao)通噪(zao)聲的元兇(xiong)，占城(cheng)(cheng)市(shi)噪(zao)聲的75%。據(ju)統計表(biao)明(ming)，北京是(shi)世界(jie)有(you)名的噪(zao)聲污(wu)染城(cheng)(cheng)市(shi)。雖然城(cheng)(cheng)市(shi)車(che)輛不(bu)及日(ri)本的十分之一， 噪(zao)聲程(cheng)度卻比日(ri)本高出1倍。特別是(shi)一些臨街的建筑(zhu)，受(shou)害(hai)極(ji)重。

2.工業(ye)機(ji)械環境噪聲

這也是室(shi)內(nei)噪聲污染的主要來源。由于各種動力機(ji)、工作機(ji) 做功(gong)時產(chan)生(sheng)的撞擊、摩擦、噴(pen)射(she)以及振(zhen)動，可產(chan)生(sheng)七(qi)八十分(fen)貝以上的聲響(xiang)。這些聲 響(xiang)，像紡(fang)織車間、鍛壓車間、粉碎車間和鋼廠、水(shui)泥廠、氣泵(beng)房(fang)、水(shui)泵(beng)房(fang)都比較嚴 重，雖然都做了一定(ding)程度的降噪處理(li)，但(dan)仍(reng)然不能從根本上消(xiao)除機(ji)器本體上所(suo)產(chan)生(sheng) 的噪聲。

3.建筑施工噪聲

建(jian)筑施(shi)工(gong)(gong)(gong)(gong)(gong)噪聲是在(zai)工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)建(jian)設實施(shi)階段，包(bao)括基礎工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)、主(zhu)體結(jie)構施(shi)工(gong)(gong)(gong)(gong)(gong)、屋(wu)面工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)所產生的噪聲(已竣工(gong)(gong)(gong)(gong)(gong)交(jiao)付使用的住宅樓進行室內裝修活動除外)

噪(zao)聲(sheng)分為晝間噪(zao)聲(sheng)和夜間噪(zao)聲(sheng)

晝間(jian)噪聲時間(jian)：指6：00到(dao)22：00之間(jian)的時段

夜間(jian)噪聲時(shi)間(jian)：指22：00到(dao)次日6：00之間(jian)的時(shi)段