噪(zao)聲(sheng)(sheng)是(shi)發(fa)聲(sheng)(sheng)體做無規則振(zhen)動(dong)時發(fa)出的(de)(de)(de)聲(sheng)(sheng)音，聲(sheng)(sheng)音由物(wu)體的(de)(de)(de)振(zhen)動(dong)產(chan)(chan)生，以波的(de)(de)(de)形式在一定的(de)(de)(de)介質(如(ru)固(gu)體、液體、氣(qi)體)中進(jin)行傳播通常(chang)所說的(de)(de)(de)噪(zao)聲(sheng)(sheng)污染是(shi)指人為造成的(de)(de)(de)。產(chan)(chan)業革命(ming)以來(lai)，各種機械設(she)備的(de)(de)(de)創(chuang)造和(he)使用，給人類帶來(lai)了繁(fan)榮和(he)進(jin)步，但(dan)同時也產(chan)(chan)生了越(yue)來(lai)越(yue)多而且越(yue)來(lai)越(yue)強的(de)(de)(de)噪(zao)聲(sheng)(sheng)。

室內噪聲的主要來源(yuan)：

1.交(jiao)通運(yun)輸噪聲

城(cheng)(cheng)市交(jiao)通(tong)(tong)業日(ri)趨(qu)發達，給人們工作和生活帶(dai)來了便捷和舒適，同時也促進了經濟的(de)發展。但不(bu)能不(bu)看到，隨著城(cheng)(cheng)鄉車(che)(che)輛的(de)增加，公路和鐵(tie)路交(jiao)通(tong)(tong)干(gan)線的(de)增多，機車(che)(che)和機動(dong)車(che)(che)輛的(de)噪聲(sheng)已成了交(jiao)通(tong)(tong)噪聲(sheng)的(de)元兇，占城(cheng)(cheng)市噪聲(sheng)的(de)75%。據統計表明，北京是(shi)世界有名的(de)噪聲(sheng)污染城(cheng)(cheng)市。雖然城(cheng)(cheng)市車(che)(che)輛不(bu)及日(ri)本的(de)十分之一(yi)， 噪聲(sheng)程度卻比日(ri)本高出1倍(bei)。特別是(shi)一(yi)些臨街的(de)建筑，受害(hai)極重。

2.工(gong)業機械環(huan)境噪聲

這(zhe)也是(shi)室內噪(zao)(zao)(zao)聲(sheng)污染的(de)(de)主要來源。由于各(ge)種動力(li)機(ji)、工作機(ji) 做功時產生的(de)(de)撞擊(ji)、摩擦、噴射以及振動，可(ke)產生七八十(shi)分貝(bei)以上的(de)(de)聲(sheng)響。這(zhe)些聲(sheng) 響，像(xiang)紡(fang)織車(che)間、鍛(duan)壓車(che)間、粉碎(sui)車(che)間和鋼廠、水泥(ni)廠、氣(qi)泵(beng)房、水泵(beng)房都比較嚴 重，雖然(ran)都做了一定程度的(de)(de)降噪(zao)(zao)(zao)處理(li)，但仍然(ran)不能從根本上消除機(ji)器本體上所產生 的(de)(de)噪(zao)(zao)(zao)聲(sheng)。

3.建筑施工噪聲

建筑(zhu)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)噪聲(sheng)是在工(gong)(gong)(gong)(gong)(gong)程(cheng)建設(she)實施(shi)(shi)階段，包括基(ji)礎工(gong)(gong)(gong)(gong)(gong)程(cheng)工(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、主體結構施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、裝(zhuang)飾(shi)工(gong)(gong)(gong)(gong)(gong)程(cheng)施(shi)(shi)工(gong)(gong)(gong)(gong)(gong)所產生的噪聲(sheng)(已竣工(gong)(gong)(gong)(gong)(gong)交付使用的住(zhu)宅樓進(jin)行室(shi)內裝(zhuang)修活動(dong)除(chu)外(wai))

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

晝間(jian)噪聲時(shi)間(jian)：指6：00到22：00之間(jian)的時(shi)段(duan)

夜間噪(zao)聲(sheng)時間：指(zhi)22：00到次日6：00之(zhi)間的時段