噪聲(sheng)(sheng)是發(fa)聲(sheng)(sheng)體做無規則振動時發(fa)出(chu)的(de)聲(sheng)(sheng)音，聲(sheng)(sheng)音由物體的(de)振動產生，以波的(de)形式(shi)在一定的(de)介質(如固(gu)體、液(ye)體、氣(qi)體)中進(jin)行傳播(bo)通常所說的(de)噪聲(sheng)(sheng)污(wu)染是指人(ren)為造成的(de)。產業(ye)革命以來，各種機械(xie)設(she)備(bei)的(de)創造和使(shi)用，給人(ren)類帶來了繁榮(rong)和進(jin)步，但同時也(ye)產生了越(yue)來越(yue)多而(er)且(qie)越(yue)來越(yue)強的(de)噪聲(sheng)(sheng)。

室內噪聲的主要來源：

1.交通(tong)運輸噪聲

城(cheng)(cheng)市(shi)交通(tong)(tong)(tong)業日趨發達，給(gei)人們工作和(he)生活帶來了便捷和(he)舒適，同時也促(cu)進了經(jing)濟的發展(zhan)。但不能不看(kan)到，隨著城(cheng)(cheng)鄉(xiang)車(che)輛的增(zeng)加，公路和(he)鐵(tie)路交通(tong)(tong)(tong)干線的增(zeng)多，機(ji)車(che)和(he)機(ji)動車(che)輛的噪聲(sheng)已(yi)成(cheng)了交通(tong)(tong)(tong)噪聲(sheng)的元兇(xiong)，占城(cheng)(cheng)市(shi)噪聲(sheng)的75%。據統計表(biao)明(ming)，北京是世界(jie)有名的噪聲(sheng)污染城(cheng)(cheng)市(shi)。雖(sui)然城(cheng)(cheng)市(shi)車(che)輛不及日本的十(shi)分之一， 噪聲(sheng)程度卻比日本高出(chu)1倍(bei)。特別(bie)是一些臨街的建(jian)筑，受(shou)害極重。

2.工業機械環(huan)境噪聲(sheng)

這也是室內噪聲(sheng)污(wu)染的(de)主(zhu)要來(lai)源。由(you)于(yu)各種動力機(ji)、工作機(ji) 做功時(shi)產生(sheng)的(de)撞擊(ji)、摩擦、噴射(she)以(yi)及振動，可產生(sheng)七八十分(fen)貝以(yi)上的(de)聲(sheng)響(xiang)。這些聲(sheng) 響(xiang)，像紡織車間(jian)、鍛壓車間(jian)、粉碎車間(jian)和鋼廠、水泥廠、氣(qi)泵(beng)房、水泵(beng)房都比(bi)較嚴 重，雖然(ran)都做了一(yi)定(ding)程度的(de)降噪處理，但仍然(ran)不(bu)能從(cong)根本上消(xiao)除機(ji)器本體上所產生(sheng) 的(de)噪聲(sheng)。

3.建筑施工噪(zao)聲

建(jian)筑施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)噪聲是在(zai)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)建(jian)設實(shi)施(shi)階段，包括(kuo)基礎工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)、主體結構施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)、屋面(mian)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)所產生的噪聲(已竣工(gong)(gong)(gong)(gong)(gong)(gong)交付使用(yong)的住宅樓進行室內裝修活動除外)

噪(zao)聲(sheng)分(fen)為(wei)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22：00之間(jian)的時段

夜間噪聲時(shi)間：指22：00到次(ci)日6：00之間的時(shi)段