噪(zao)聲(sheng)(sheng)是發(fa)聲(sheng)(sheng)體(ti)做無(wu)規則振動時發(fa)出的聲(sheng)(sheng)音，聲(sheng)(sheng)音由物體(ti)的振動產(chan)生(sheng)，以波的形(xing)式在一定的介質(如固體(ti)、液體(ti)、氣體(ti))中進(jin)行(xing)傳播通常所說的噪(zao)聲(sheng)(sheng)污(wu)染是指人(ren)(ren)為造成(cheng)的。產(chan)業(ye)革命以來，各種機械設備的創造和(he)使(shi)用，給人(ren)(ren)類(lei)帶來了繁榮和(he)進(jin)步，但同時也產(chan)生(sheng)了越(yue)(yue)來越(yue)(yue)多而(er)且越(yue)(yue)來越(yue)(yue)強(qiang)的噪(zao)聲(sheng)(sheng)。

室內(nei)噪聲的主要(yao)來源：

1.交通運輸噪聲

城(cheng)(cheng)市(shi)交(jiao)通業日趨發達(da)，給人(ren)們工作(zuo)和(he)(he)生活帶來(lai)了(le)(le)便捷和(he)(he)舒適，同時也促進(jin)了(le)(le)經濟的(de)(de)(de)發展。但不能不看(kan)到，隨著城(cheng)(cheng)鄉車(che)輛的(de)(de)(de)增(zeng)加，公路(lu)和(he)(he)鐵(tie)路(lu)交(jiao)通干(gan)線的(de)(de)(de)增(zeng)多(duo)，機車(che)和(he)(he)機動車(che)輛的(de)(de)(de)噪(zao)(zao)聲已成了(le)(le)交(jiao)通噪(zao)(zao)聲的(de)(de)(de)元兇，占城(cheng)(cheng)市(shi)噪(zao)(zao)聲的(de)(de)(de)75%。據統計(ji)表明(ming)，北京是世(shi)界(jie)有名的(de)(de)(de)噪(zao)(zao)聲污染城(cheng)(cheng)市(shi)。雖然城(cheng)(cheng)市(shi)車(che)輛不及日本的(de)(de)(de)十分之一(yi)， 噪(zao)(zao)聲程度卻比日本高(gao)出(chu)1倍。特別是一(yi)些臨街的(de)(de)(de)建(jian)筑，受害極重(zhong)。

2.工業機械環境噪聲

這也是室內(nei)噪(zao)聲(sheng)污(wu)染的主要來源。由于(yu)各種動力機、工作機 做功時產生(sheng)的撞擊、摩擦、噴射以及振動，可產生(sheng)七八十分貝以上(shang)的聲(sheng)響(xiang)。這些聲(sheng) 響(xiang)，像紡織車(che)間(jian)(jian)、鍛壓車(che)間(jian)(jian)、粉碎車(che)間(jian)(jian)和鋼(gang)廠(chang)(chang)、水泥廠(chang)(chang)、氣泵房(fang)、水泵房(fang)都比較嚴 重，雖(sui)然都做了一(yi)定程度的降(jiang)噪(zao)處理，但仍然不能從(cong)根本上(shang)消除(chu)機器本體上(shang)所產生(sheng) 的噪(zao)聲(sheng)。

3.建筑(zhu)施(shi)工噪聲

建筑施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)噪聲是在工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)建設實施(shi)(shi)階段(duan)，包括基礎工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、主體(ti)結(jie)構施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、屋(wu)面(mian)工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、裝(zhuang)飾工(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)所產生的噪聲(已竣工(gong)(gong)(gong)(gong)(gong)交付(fu)使用(yong)的住宅樓(lou)進(jin)行室內裝(zhuang)修活動(dong)除外(wai))

噪(zao)(zao)聲分為晝間噪(zao)(zao)聲和夜間噪(zao)(zao)聲

晝間(jian)(jian)噪(zao)聲(sheng)時間(jian)(jian)：指6：00到22：00之(zhi)間(jian)(jian)的時段

夜間(jian)噪聲(sheng)時間(jian)：指22：00到(dao)次日6：00之間(jian)的時段(duan)