噪聲(sheng)是發聲(sheng)體(ti)做(zuo)無(wu)規則振(zhen)動時發出的(de)(de)(de)聲(sheng)音，聲(sheng)音由物(wu)體(ti)的(de)(de)(de)振(zhen)動產(chan)生(sheng)，以波的(de)(de)(de)形式在一定的(de)(de)(de)介(jie)質(如(ru)固體(ti)、液體(ti)、氣體(ti))中進行(xing)傳播通常所說的(de)(de)(de)噪聲(sheng)污染(ran)是指人為造成(cheng)的(de)(de)(de)。產(chan)業革命以來，各(ge)種(zhong)機械(xie)設備的(de)(de)(de)創造和(he)使用，給人類帶來了繁榮和(he)進步，但同時也產(chan)生(sheng)了越來越多(duo)而且(qie)越來越強的(de)(de)(de)噪聲(sheng)。

室內噪聲的(de)主要來源：

1.交通(tong)運輸噪聲(sheng)

城市(shi)交(jiao)通(tong)(tong)業日趨發達，給人們工作和生活(huo)帶來(lai)了便(bian)捷和舒(shu)適，同時也促(cu)進了經濟的(de)發展。但不(bu)能不(bu)看到，隨著城鄉車(che)(che)輛(liang)的(de)增加，公(gong)路(lu)和鐵路(lu)交(jiao)通(tong)(tong)干線(xian)的(de)增多，機(ji)(ji)車(che)(che)和機(ji)(ji)動車(che)(che)輛(liang)的(de)噪聲(sheng)(sheng)已成了交(jiao)通(tong)(tong)噪聲(sheng)(sheng)的(de)元兇，占(zhan)城市(shi)噪聲(sheng)(sheng)的(de)75%。據統計表明，北京是世界有名的(de)噪聲(sheng)(sheng)污染城市(shi)。雖然城市(shi)車(che)(che)輛(liang)不(bu)及(ji)日本的(de)十分之一， 噪聲(sheng)(sheng)程度卻比日本高出1倍。特別是一些臨(lin)街的(de)建筑，受害(hai)極(ji)重(zhong)。

2.工(gong)業機械(xie)環境噪聲

這也(ye)是室內噪(zao)聲(sheng)污(wu)染的(de)(de)主要來源。由于各種動力機(ji)、工作(zuo)機(ji) 做功時產生(sheng)的(de)(de)撞擊、摩擦、噴(pen)射以(yi)及(ji)振動，可產生(sheng)七八十分貝以(yi)上的(de)(de)聲(sheng)響。這些聲(sheng) 響，像(xiang)紡織(zhi)車(che)(che)間、鍛(duan)壓車(che)(che)間、粉碎車(che)(che)間和鋼廠(chang)(chang)、水泥廠(chang)(chang)、氣泵房、水泵房都(dou)(dou)比較(jiao)嚴(yan) 重(zhong)，雖然都(dou)(dou)做了一(yi)定程度的(de)(de)降(jiang)噪(zao)處理，但仍然不能從(cong)根本上消除機(ji)器本體上所(suo)產生(sheng) 的(de)(de)噪(zao)聲(sheng)。

3.建筑施工噪(zao)聲

建(jian)筑施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)噪(zao)聲(sheng)是(shi)在工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)建(jian)設(she)實施(shi)階(jie)段，包括基礎(chu)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、主(zhu)體結(jie)構施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、屋(wu)面工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)所(suo)產生的噪(zao)聲(sheng)(已竣工(gong)(gong)(gong)(gong)(gong)(gong)(gong)交付使用的住宅樓進行室(shi)內裝修活動除外)

噪聲分為晝間(jian)噪聲和夜間(jian)噪聲

晝(zhou)間噪聲時間：指6：00到22：00之間的時段(duan)

夜間噪聲時間：指22：00到次日6：00之間的時段