噪(zao)(zao)聲(sheng)(sheng)是(shi)發(fa)聲(sheng)(sheng)體做無規則振(zhen)動時發(fa)出的(de)(de)聲(sheng)(sheng)音，聲(sheng)(sheng)音由物體的(de)(de)振(zhen)動產(chan)生，以波的(de)(de)形式在(zai)一定的(de)(de)介(jie)質(如(ru)固體、液體、氣(qi)體)中進(jin)行(xing)傳播(bo)通(tong)常所說的(de)(de)噪(zao)(zao)聲(sheng)(sheng)污染是(shi)指人為造成的(de)(de)。產(chan)業革命以來(lai)，各(ge)種機械設備的(de)(de)創造和(he)(he)使用，給人類帶(dai)來(lai)了(le)繁(fan)榮和(he)(he)進(jin)步(bu)，但同(tong)時也產(chan)生了(le)越來(lai)越多而且越來(lai)越強(qiang)的(de)(de)噪(zao)(zao)聲(sheng)(sheng)。

室內噪聲的主要來源：

1.交通運輸噪聲

城(cheng)市(shi)交通業日(ri)趨發達，給人們工作和生活帶(dai)來了(le)便捷和舒適，同時(shi)也促進了(le)經濟的(de)發展。但不能不看到，隨著(zhu)城(cheng)鄉車(che)輛(liang)的(de)增(zeng)加，公(gong)路(lu)(lu)和鐵(tie)路(lu)(lu)交通干線的(de)增(zeng)多，機車(che)和機動車(che)輛(liang)的(de)噪(zao)聲(sheng)(sheng)已(yi)成了(le)交通噪(zao)聲(sheng)(sheng)的(de)元兇，占城(cheng)市(shi)噪(zao)聲(sheng)(sheng)的(de)75%。據統計(ji)表明，北京是世(shi)界(jie)有(you)名的(de)噪(zao)聲(sheng)(sheng)污(wu)染城(cheng)市(shi)。雖然城(cheng)市(shi)車(che)輛(liang)不及日(ri)本的(de)十分之一， 噪(zao)聲(sheng)(sheng)程度卻(que)比日(ri)本高出1倍。特別是一些臨街(jie)的(de)建筑(zhu)，受(shou)害極重(zhong)。

2.工(gong)業機械環境噪聲

這也是室內(nei)噪聲污染的(de)主(zhu)要(yao)來源。由于各種動力機、工作機 做功時產生(sheng)的(de)撞擊、摩擦、噴(pen)射以及振(zhen)動，可產生(sheng)七八十(shi)分貝(bei)以上的(de)聲響。這些(xie)聲 響，像紡織車間、鍛壓(ya)車間、粉碎車間和鋼(gang)廠、水泥廠、氣泵(beng)房、水泵(beng)房都比(bi)較嚴 重，雖然(ran)都做了一定程度的(de)降噪處理，但(dan)仍然(ran)不(bu)能從根本上消除機器本體上所產生(sheng) 的(de)噪聲。

3.建(jian)筑(zhu)施工噪聲(sheng)

建(jian)筑施工(gong)(gong)(gong)(gong)(gong)(gong)噪聲是在工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)建(jian)設實施階段(duan)，包括(kuo)基礎工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)、主體結構施工(gong)(gong)(gong)(gong)(gong)(gong)、屋面(mian)工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)、裝(zhuang)飾工(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)所產生的噪聲(已竣工(gong)(gong)(gong)(gong)(gong)(gong)交付使用(yong)的住宅樓(lou)進行室內裝(zhuang)修活動除外)

噪聲(sheng)分為晝間噪聲(sheng)和(he)夜間噪聲(sheng)

晝間(jian)噪聲時間(jian)：指6：00到22：00之間(jian)的時段

夜間噪(zao)聲時間：指22：00到次日6：00之間的時段