噪(zao)聲(sheng)(sheng)是(shi)發聲(sheng)(sheng)體做無規則(ze)振(zhen)動(dong)時(shi)發出的聲(sheng)(sheng)音(yin)，聲(sheng)(sheng)音(yin)由物體的振(zhen)動(dong)產生，以波的形(xing)式在一(yi)定的介質(如固體、液體、氣體)中進行傳(chuan)播(bo)通(tong)常所(suo)說(shuo)的噪(zao)聲(sheng)(sheng)污染是(shi)指人(ren)為(wei)造成(cheng)的。產業(ye)革命以來，各(ge)種(zhong)機械設備的創造和使用，給(gei)人(ren)類(lei)帶來了繁榮和進步，但同時(shi)也(ye)產生了越來越多而且越來越強的噪(zao)聲(sheng)(sheng)。

室內噪聲(sheng)的主要來(lai)源：

1.交通運輸噪聲

城(cheng)市交通(tong)業(ye)日(ri)(ri)趨發(fa)(fa)達，給人們工(gong)作和生活帶(dai)來(lai)了便(bian)捷和舒適(shi)，同時也促進了經濟的(de)(de)發(fa)(fa)展(zhan)。但不能不看到，隨著城(cheng)鄉車(che)輛的(de)(de)增加，公路和鐵路交通(tong)干(gan)線的(de)(de)增多(duo)，機車(che)和機動車(che)輛的(de)(de)噪(zao)聲(sheng)(sheng)已成了交通(tong)噪(zao)聲(sheng)(sheng)的(de)(de)元(yuan)兇，占城(cheng)市噪(zao)聲(sheng)(sheng)的(de)(de)75%。據統(tong)計(ji)表明(ming)，北京是(shi)世界有名的(de)(de)噪(zao)聲(sheng)(sheng)污染城(cheng)市。雖然城(cheng)市車(che)輛不及日(ri)(ri)本的(de)(de)十(shi)分之一(yi)， 噪(zao)聲(sheng)(sheng)程(cheng)度(du)卻比(bi)日(ri)(ri)本高出1倍。特別是(shi)一(yi)些臨街的(de)(de)建(jian)筑，受害極重。

2.工業機械環境噪聲(sheng)

這也是室內噪聲污染的(de)主要來源。由于(yu)各種動力機、工(gong)作(zuo)機 做功(gong)時(shi)產(chan)(chan)(chan)生(sheng)的(de)撞擊、摩擦、噴射以及(ji)振動，可產(chan)(chan)(chan)生(sheng)七八十(shi)分貝以上(shang)的(de)聲響(xiang)。這些(xie)聲 響(xiang)，像(xiang)紡織車間(jian)、鍛壓車間(jian)、粉碎車間(jian)和(he)鋼廠、水(shui)泥廠、氣泵(beng)房、水(shui)泵(beng)房都(dou)(dou)比較嚴(yan) 重，雖(sui)然都(dou)(dou)做了一定程(cheng)度的(de)降噪處理(li)，但仍然不能(neng)從根本上(shang)消除機器本體上(shang)所產(chan)(chan)(chan)生(sheng) 的(de)噪聲。

3.建筑施工噪聲

建(jian)筑施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)噪聲是在工(gong)(gong)(gong)(gong)(gong)程建(jian)設實施(shi)(shi)(shi)(shi)階(jie)段，包括基礎(chu)工(gong)(gong)(gong)(gong)(gong)程工(gong)(gong)(gong)(gong)(gong)程施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、主(zhu)體結構施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)(gong)程施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)、裝(zhuang)飾(shi)工(gong)(gong)(gong)(gong)(gong)程施(shi)(shi)(shi)(shi)工(gong)(gong)(gong)(gong)(gong)所(suo)產生的噪聲(已竣工(gong)(gong)(gong)(gong)(gong)交付使用的住宅樓進行室內裝(zhuang)修(xiu)活動除外(wai))

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

晝間噪(zao)聲(sheng)時間：指6：00到(dao)22：00之間的(de)時段

夜間(jian)噪聲時(shi)間(jian)：指22：00到次日6：00之(zhi)間(jian)的時(shi)段