噪(zao)聲是發(fa)聲體做(zuo)無規則(ze)振動(dong)時發(fa)出(chu)的(de)(de)聲音，聲音由物體的(de)(de)振動(dong)產(chan)(chan)生，以波的(de)(de)形式在一(yi)定的(de)(de)介質(如固體、液(ye)體、氣(qi)體)中進行傳播通常所說的(de)(de)噪(zao)聲污染是指人為造成的(de)(de)。產(chan)(chan)業(ye)革命以來(lai)，各種機(ji)械設備的(de)(de)創造和(he)使用，給人類帶來(lai)了(le)繁榮和(he)進步，但同時也產(chan)(chan)生了(le)越來(lai)越多而(er)且(qie)越來(lai)越強(qiang)的(de)(de)噪(zao)聲。

室內噪聲(sheng)的主要來源：

1.交通運輸(shu)噪聲

城(cheng)(cheng)市(shi)(shi)交(jiao)通(tong)業日趨(qu)發達，給人們工作(zuo)和(he)生活帶來(lai)了便捷(jie)和(he)舒適，同時也促進了經濟的發展。但不(bu)能不(bu)看到，隨著城(cheng)(cheng)鄉車(che)輛(liang)的增加(jia)，公(gong)路和(he)鐵路交(jiao)通(tong)干線的增多(duo)，機車(che)和(he)機動車(che)輛(liang)的噪(zao)聲已成了交(jiao)通(tong)噪(zao)聲的元(yuan)兇，占城(cheng)(cheng)市(shi)(shi)噪(zao)聲的75%。據統計表明，北京是(shi)世界有名(ming)的噪(zao)聲污染城(cheng)(cheng)市(shi)(shi)。雖(sui)然(ran)城(cheng)(cheng)市(shi)(shi)車(che)輛(liang)不(bu)及日本(ben)的十分之一， 噪(zao)聲程(cheng)度卻比日本(ben)高出1倍。特別是(shi)一些臨街(jie)的建筑，受(shou)害(hai)極重。

2.工業機械環境噪(zao)聲(sheng)

這(zhe)也是室內(nei)噪聲污(wu)染的主要(yao)來源。由(you)于(yu)各種動力機、工作(zuo)機 做功時產(chan)生(sheng)的撞擊(ji)、摩擦、噴(pen)射(she)以及振動，可產(chan)生(sheng)七(qi)八十(shi)分貝以上的聲響。這(zhe)些聲 響，像紡(fang)織車間(jian)、鍛(duan)壓車間(jian)、粉碎車間(jian)和鋼廠、水泥廠、氣泵房(fang)(fang)、水泵房(fang)(fang)都(dou)比較嚴 重(zhong)，雖然都(dou)做了一定程度的降(jiang)噪處(chu)理，但(dan)仍然不能從根本上消除(chu)機器本體上所產(chan)生(sheng) 的噪聲。

3.建筑施工(gong)噪(zao)聲(sheng)

建筑施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)噪聲是(shi)在工(gong)(gong)(gong)(gong)(gong)程(cheng)建設(she)實施(shi)(shi)(shi)(shi)階段，包括基礎工(gong)(gong)(gong)(gong)(gong)程(cheng)工(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、主(zhu)體結(jie)構(gou)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)所產生的(de)噪聲(已(yi)竣工(gong)(gong)(gong)(gong)(gong)交(jiao)付使用的(de)住(zhu)宅樓進行室內裝修活動除外)

噪聲(sheng)分為晝間噪聲(sheng)和夜間噪聲(sheng)

晝(zhou)間噪聲時間：指6：00到22：00之(zhi)間的時段(duan)

夜間噪聲時間：指(zhi)22：00到(dao)次日6：00之間的時段