噪聲(sheng)是(shi)發(fa)聲(sheng)體做無規則振(zhen)動時發(fa)出的(de)(de)(de)聲(sheng)音，聲(sheng)音由物體的(de)(de)(de)振(zhen)動產(chan)生(sheng)，以波的(de)(de)(de)形式在一定(ding)的(de)(de)(de)介質(zhi)(如固體、液(ye)體、氣體)中進行(xing)傳播(bo)通(tong)常所說(shuo)的(de)(de)(de)噪聲(sheng)污染是(shi)指人(ren)為造成(cheng)的(de)(de)(de)。產(chan)業革命以來(lai)，各種(zhong)機械設備的(de)(de)(de)創造和(he)使用，給人(ren)類(lei)帶來(lai)了(le)繁榮和(he)進步(bu)，但(dan)同時也產(chan)生(sheng)了(le)越(yue)(yue)來(lai)越(yue)(yue)多而且越(yue)(yue)來(lai)越(yue)(yue)強的(de)(de)(de)噪聲(sheng)。

室內噪聲(sheng)的主要來源：

1.交通運(yun)輸噪(zao)聲

城(cheng)市交通(tong)業日(ri)趨發達，給(gei)人們工作(zuo)和(he)生活帶來了便捷(jie)和(he)舒適，同時也促進了經濟的(de)(de)(de)發展。但不能不看到，隨著城(cheng)鄉車輛的(de)(de)(de)增(zeng)加，公路和(he)鐵路交通(tong)干線的(de)(de)(de)增(zeng)多，機(ji)車和(he)機(ji)動車輛的(de)(de)(de)噪(zao)聲(sheng)(sheng)(sheng)已成了交通(tong)噪(zao)聲(sheng)(sheng)(sheng)的(de)(de)(de)元兇，占(zhan)城(cheng)市噪(zao)聲(sheng)(sheng)(sheng)的(de)(de)(de)75%。據統計表(biao)明，北京是世(shi)界有名(ming)的(de)(de)(de)噪(zao)聲(sheng)(sheng)(sheng)污染城(cheng)市。雖然城(cheng)市車輛不及日(ri)本的(de)(de)(de)十分(fen)之一， 噪(zao)聲(sheng)(sheng)(sheng)程度卻比日(ri)本高出1倍。特別是一些臨街的(de)(de)(de)建筑，受害(hai)極重。

2.工業機(ji)械環境噪(zao)聲(sheng)

這也(ye)是室(shi)內(nei)噪聲污(wu)染的(de)主(zhu)要來源。由于(yu)各(ge)種動力機(ji)、工作機(ji) 做功時產生的(de)撞(zhuang)擊、摩擦、噴(pen)射以(yi)及振動，可產生七八十分貝以(yi)上的(de)聲響。這些聲 響，像紡織車間、鍛(duan)壓車間、粉碎車間和(he)鋼廠、水泥(ni)廠、氣泵房(fang)、水泵房(fang)都比較嚴 重，雖然都做了一定程度的(de)降(jiang)噪處理，但仍然不能從根本上消除機(ji)器(qi)本體上所產生 的(de)噪聲。

3.建(jian)筑施工噪聲

建(jian)筑施工(gong)(gong)(gong)(gong)(gong)(gong)噪聲是在(zai)工(gong)(gong)(gong)(gong)(gong)(gong)程建(jian)設(she)實施階段，包括基礎工(gong)(gong)(gong)(gong)(gong)(gong)程工(gong)(gong)(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)(gong)(gong)、主體結構施工(gong)(gong)(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)(gong)(gong)所產生的(de)噪聲(已竣工(gong)(gong)(gong)(gong)(gong)(gong)交付使用的(de)住宅樓進(jin)行(xing)室(shi)內(nei)裝修活動除外(wai))

噪聲分為(wei)晝間噪聲和夜間噪聲

晝間(jian)噪(zao)聲時(shi)間(jian)：指(zhi)6：00到22：00之間(jian)的時(shi)段

夜間(jian)(jian)噪(zao)聲時(shi)間(jian)(jian)：指(zhi)22：00到次日6：00之間(jian)(jian)的時(shi)段