噪聲(sheng)(sheng)是發聲(sheng)(sheng)體做(zuo)無規則振(zhen)動時發出的(de)聲(sheng)(sheng)音(yin)，聲(sheng)(sheng)音(yin)由物體的(de)振(zhen)動產(chan)生，以(yi)(yi)波的(de)形式在一定的(de)介質(如固體、液(ye)體、氣體)中(zhong)進(jin)(jin)行(xing)傳播通常所說(shuo)的(de)噪聲(sheng)(sheng)污染(ran)是指人為造成的(de)。產(chan)業(ye)革命以(yi)(yi)來，各(ge)種(zhong)機械設備的(de)創造和(he)使用(yong)，給人類帶來了(le)(le)繁(fan)榮和(he)進(jin)(jin)步(bu)，但同時也產(chan)生了(le)(le)越(yue)來越(yue)多而且越(yue)來越(yue)強的(de)噪聲(sheng)(sheng)。

室內噪聲(sheng)的主要來源：

1.交通運輸噪(zao)聲(sheng)

城(cheng)市(shi)交(jiao)通業日(ri)趨發達，給(gei)人們工作和(he)生活帶來(lai)了便捷和(he)舒(shu)適，同(tong)時也促進了經濟的(de)發展。但不能不看到，隨著城(cheng)鄉車輛(liang)的(de)增(zeng)加，公路(lu)和(he)鐵路(lu)交(jiao)通干線的(de)增(zeng)多(duo)，機(ji)車和(he)機(ji)動(dong)車輛(liang)的(de)噪聲已成了交(jiao)通噪聲的(de)元兇，占城(cheng)市(shi)噪聲的(de)75%。據(ju)統計表明(ming)，北京是世界有名(ming)的(de)噪聲污(wu)染(ran)城(cheng)市(shi)。雖然城(cheng)市(shi)車輛(liang)不及日(ri)本的(de)十分之一(yi)， 噪聲程度卻比(bi)日(ri)本高出1倍。特別(bie)是一(yi)些臨(lin)街(jie)的(de)建筑，受(shou)害極重(zhong)。

2.工業機械環境噪聲

這也是室內(nei)噪(zao)聲污染的主(zhu)要來(lai)源。由(you)于各種動(dong)力機、工作(zuo)機 做功(gong)時產生(sheng)的撞擊、摩(mo)擦、噴射以及振動(dong)，可產生(sheng)七八十分(fen)貝以上(shang)的聲響(xiang)。這些(xie)聲 響(xiang)，像紡織車(che)間(jian)、鍛壓車(che)間(jian)、粉碎車(che)間(jian)和鋼廠、水(shui)泥廠、氣泵房、水(shui)泵房都(dou)比較(jiao)嚴(yan) 重，雖然(ran)都(dou)做了一定程度的降噪(zao)處理，但(dan)仍然(ran)不能從根本(ben)上(shang)消除機器本(ben)體上(shang)所產生(sheng) 的噪(zao)聲。

3.建筑施(shi)工噪聲(sheng)

建筑施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)噪聲是在(zai)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)建設實施階段(duan)，包括基(ji)礎工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、主體結構施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)、裝飾(shi)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)程(cheng)施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)所產生的噪聲(已(yi)竣工(gong)(gong)(gong)(gong)(gong)(gong)(gong)交付使用的住(zhu)宅樓進行室內裝修(xiu)活動除外(wai))

噪(zao)聲分為晝間噪(zao)聲和夜間噪(zao)聲

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

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