噪(zao)(zao)聲是(shi)發(fa)聲體做無規(gui)則(ze)振(zhen)動(dong)時發(fa)出(chu)的(de)(de)聲音(yin)，聲音(yin)由物體的(de)(de)振(zhen)動(dong)產生(sheng)，以(yi)波(bo)的(de)(de)形式在(zai)一定的(de)(de)介質(zhi)(如固體、液體、氣體)中進行傳播(bo)通常所說的(de)(de)噪(zao)(zao)聲污染是(shi)指人(ren)為造成的(de)(de)。產業革命以(yi)來，各種機械(xie)設備(bei)的(de)(de)創造和使(shi)用，給人(ren)類帶來了繁榮(rong)和進步(bu)，但同時也產生(sheng)了越來越多而且越來越強的(de)(de)噪(zao)(zao)聲。

室內噪聲的主(zhu)要(yao)來源：

1.交通運(yun)輸噪聲

城(cheng)市交(jiao)通業(ye)日趨發(fa)達，給(gei)人(ren)們工(gong)作和(he)生活帶來了(le)便捷和(he)舒適，同時(shi)也促進了(le)經濟的(de)(de)發(fa)展。但不能不看(kan)到，隨著城(cheng)鄉車(che)輛的(de)(de)增加(jia)，公路和(he)鐵路交(jiao)通干線的(de)(de)增多，機車(che)和(he)機動車(che)輛的(de)(de)噪(zao)(zao)聲已成了(le)交(jiao)通噪(zao)(zao)聲的(de)(de)元兇，占城(cheng)市噪(zao)(zao)聲的(de)(de)75%。據(ju)統計表明，北京是世界有名(ming)的(de)(de)噪(zao)(zao)聲污染城(cheng)市。雖然城(cheng)市車(che)輛不及日本的(de)(de)十分之一， 噪(zao)(zao)聲程度卻(que)比日本高出1倍。特(te)別(bie)是一些臨街的(de)(de)建筑(zhu)，受(shou)害極重。

2.工業機械環境(jing)噪聲

這也是室內(nei)噪聲污染的(de)主(zhu)要(yao)來(lai)源。由于各種動力機、工作(zuo)機 做功(gong)時產生(sheng)的(de)撞擊、摩擦、噴射以及振動，可產生(sheng)七八(ba)十分貝以上的(de)聲響。這些聲 響，像(xiang)紡織車(che)間(jian)、鍛壓(ya)車(che)間(jian)、粉碎車(che)間(jian)和鋼廠、水(shui)泥廠、氣泵房(fang)、水(shui)泵房(fang)都比較嚴 重，雖(sui)然都做了一定程度的(de)降噪處(chu)理(li)，但仍然不能從根本(ben)上消除機器本(ben)體上所產生(sheng) 的(de)噪聲。

3.建筑施工噪聲

建筑施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)噪(zao)聲是在工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)建設實施階段，包括基礎工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、主(zhu)體結構施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)所(suo)產生的(de)噪(zao)聲(已竣工(gong)(gong)(gong)(gong)(gong)(gong)(gong)交(jiao)付使用的(de)住宅樓進(jin)行室內裝修活動除外)

噪(zao)聲(sheng)分為晝間噪(zao)聲(sheng)和夜(ye)間噪(zao)聲(sheng)

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

夜間(jian)噪聲時間(jian)：指22：00到(dao)次日6：00之(zhi)間(jian)的時段