噪聲(sheng)(sheng)(sheng)是(shi)發聲(sheng)(sheng)(sheng)體(ti)(ti)做無規則振(zhen)動時(shi)發出的(de)聲(sheng)(sheng)(sheng)音，聲(sheng)(sheng)(sheng)音由(you)物體(ti)(ti)的(de)振(zhen)動產(chan)(chan)生，以波的(de)形式在一(yi)定的(de)介質(如固體(ti)(ti)、液體(ti)(ti)、氣體(ti)(ti))中進行(xing)傳播通常所說的(de)噪聲(sheng)(sheng)(sheng)污(wu)染是(shi)指(zhi)人為造(zao)成(cheng)的(de)。產(chan)(chan)業(ye)革命以來(lai)，各種機械設(she)備的(de)創造(zao)和(he)使用(yong)，給人類帶來(lai)了繁(fan)榮和(he)進步，但同時(shi)也產(chan)(chan)生了越來(lai)越多而且越來(lai)越強(qiang)的(de)噪聲(sheng)(sheng)(sheng)。

室內噪聲的主要來源：

1.交通運輸噪聲

城(cheng)(cheng)市(shi)交(jiao)通(tong)(tong)業日(ri)(ri)趨發達，給人(ren)們(men)工(gong)作(zuo)和(he)生活帶來了(le)便捷和(he)舒適，同時(shi)也促進(jin)了(le)經濟的(de)(de)(de)(de)發展。但不能不看到，隨(sui)著城(cheng)(cheng)鄉車輛(liang)的(de)(de)(de)(de)增加，公路和(he)鐵路交(jiao)通(tong)(tong)干線的(de)(de)(de)(de)增多，機車和(he)機動(dong)車輛(liang)的(de)(de)(de)(de)噪(zao)聲已成了(le)交(jiao)通(tong)(tong)噪(zao)聲的(de)(de)(de)(de)元(yuan)兇，占城(cheng)(cheng)市(shi)噪(zao)聲的(de)(de)(de)(de)75%。據統計(ji)表明，北京是世界(jie)有(you)名(ming)的(de)(de)(de)(de)噪(zao)聲污染城(cheng)(cheng)市(shi)。雖然城(cheng)(cheng)市(shi)車輛(liang)不及日(ri)(ri)本(ben)的(de)(de)(de)(de)十分之一， 噪(zao)聲程度卻比日(ri)(ri)本(ben)高出1倍。特別是一些臨街的(de)(de)(de)(de)建(jian)筑，受害極(ji)重。

2.工(gong)業機械環境噪聲

這(zhe)也是室內噪聲(sheng)污染(ran)的主(zhu)要(yao)來源。由(you)于各種動(dong)(dong)力機(ji)、工作機(ji) 做功(gong)時(shi)產(chan)生的撞(zhuang)擊、摩擦、噴射以(yi)及振動(dong)(dong)，可(ke)產(chan)生七八十分(fen)貝(bei)以(yi)上(shang)的聲(sheng)響。這(zhe)些聲(sheng) 響，像紡織車間(jian)、鍛(duan)壓車間(jian)、粉碎車間(jian)和鋼廠、水(shui)泥廠、氣泵房、水(shui)泵房都(dou)(dou)比較(jiao)嚴 重，雖然都(dou)(dou)做了一(yi)定程度的降噪處理，但(dan)仍然不(bu)能從根本上(shang)消除機(ji)器本體上(shang)所(suo)產(chan)生 的噪聲(sheng)。

3.建筑施工噪聲

建筑(zhu)施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)噪聲是在(zai)工(gong)(gong)(gong)(gong)程(cheng)建設實施(shi)(shi)(shi)階(jie)段(duan)，包括基礎工(gong)(gong)(gong)(gong)程(cheng)工(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)、主體結構施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)(shi)工(gong)(gong)(gong)(gong)所產(chan)生的噪聲(已竣工(gong)(gong)(gong)(gong)交付使(shi)用的住宅樓進行室內裝修活(huo)動(dong)除外)

噪聲分為晝(zhou)間噪聲和夜(ye)間噪聲

晝間(jian)(jian)噪聲時(shi)間(jian)(jian)：指6：00到22：00之間(jian)(jian)的時(shi)段(duan)

夜間噪(zao)聲(sheng)時間：指22：00到次日6：00之間的時段