噪聲(sheng)是發(fa)聲(sheng)體做無規(gui)則振動時發(fa)出的(de)(de)(de)(de)聲(sheng)音，聲(sheng)音由(you)物(wu)體的(de)(de)(de)(de)振動產(chan)生，以波的(de)(de)(de)(de)形式在一(yi)定的(de)(de)(de)(de)介質(如固體、液體、氣體)中進行傳播通常所說的(de)(de)(de)(de)噪聲(sheng)污染(ran)是指人為造成的(de)(de)(de)(de)。產(chan)業革命以來(lai)(lai)，各種機械設(she)備的(de)(de)(de)(de)創造和(he)使(shi)用，給(gei)人類(lei)帶來(lai)(lai)了(le)繁榮和(he)進步(bu)，但同時也產(chan)生了(le)越(yue)來(lai)(lai)越(yue)多而(er)且越(yue)來(lai)(lai)越(yue)強的(de)(de)(de)(de)噪聲(sheng)。

室內噪聲的主要來源(yuan)：

1.交通運輸噪聲

城(cheng)市(shi)交(jiao)通(tong)業日(ri)趨發達，給(gei)人們(men)工作和生活帶來了便捷和舒適，同時也促進了經濟(ji)的發展(zhan)。但(dan)不(bu)能不(bu)看到，隨(sui)著城(cheng)鄉車(che)輛(liang)的增加，公路和鐵路交(jiao)通(tong)干線(xian)的增多，機車(che)和機動(dong)車(che)輛(liang)的噪(zao)聲(sheng)已(yi)成了交(jiao)通(tong)噪(zao)聲(sheng)的元(yuan)兇，占城(cheng)市(shi)噪(zao)聲(sheng)的75%。據(ju)統計表明，北京是世界有名的噪(zao)聲(sheng)污染城(cheng)市(shi)。雖然(ran)城(cheng)市(shi)車(che)輛(liang)不(bu)及日(ri)本(ben)的十分(fen)之一， 噪(zao)聲(sheng)程(cheng)度(du)卻比日(ri)本(ben)高出(chu)1倍。特別是一些臨街的建筑，受(shou)害極(ji)重。

2.工業(ye)機械環境噪聲(sheng)

這也是室內噪聲污染的(de)主要來源。由于各種動力(li)機、工作(zuo)機 做(zuo)功時產(chan)生的(de)撞擊(ji)、摩擦、噴(pen)射以及振動，可產(chan)生七八十分(fen)貝以上(shang)的(de)聲響。這些聲 響，像紡(fang)織車間、鍛(duan)壓車間、粉碎車間和鋼廠、水泥廠、氣(qi)泵(beng)房、水泵(beng)房都比(bi)較嚴 重(zhong)，雖(sui)然都做(zuo)了一定程度的(de)降(jiang)噪處(chu)理，但(dan)仍然不(bu)能從(cong)根本(ben)上(shang)消(xiao)除機器本(ben)體上(shang)所產(chan)生 的(de)噪聲。

3.建筑施(shi)工(gong)噪(zao)聲

建(jian)筑(zhu)施工(gong)(gong)(gong)(gong)(gong)(gong)噪聲是在工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)建(jian)設實施階段(duan)，包括基(ji)礎(chu)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)、主體(ti)結構施工(gong)(gong)(gong)(gong)(gong)(gong)、屋(wu)面工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)、裝飾(shi)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)所(suo)產生的(de)噪聲(已竣工(gong)(gong)(gong)(gong)(gong)(gong)交付使用的(de)住宅樓進行室(shi)內(nei)裝修活動除外(wai))

噪聲分(fen)為(wei)晝間噪聲和夜間噪聲

晝間噪聲時間：指(zhi)6：00到(dao)22：00之間的時段(duan)

夜間噪(zao)聲時(shi)間：指22：00到次日6：00之間的(de)時(shi)段