噪(zao)聲(sheng)是發聲(sheng)體(ti)(ti)做無規則振動時(shi)發出的(de)(de)(de)聲(sheng)音(yin)，聲(sheng)音(yin)由物(wu)體(ti)(ti)的(de)(de)(de)振動產(chan)生，以(yi)波的(de)(de)(de)形式在一(yi)定的(de)(de)(de)介質(如固體(ti)(ti)、液體(ti)(ti)、氣體(ti)(ti))中進行傳(chuan)播通常(chang)所(suo)說的(de)(de)(de)噪(zao)聲(sheng)污染是指(zhi)人(ren)為造成(cheng)的(de)(de)(de)。產(chan)業(ye)革命以(yi)來(lai)(lai)，各種機械(xie)設備的(de)(de)(de)創造和(he)使(shi)用，給(gei)人(ren)類帶(dai)來(lai)(lai)了繁榮(rong)和(he)進步，但同時(shi)也產(chan)生了越(yue)(yue)來(lai)(lai)越(yue)(yue)多(duo)而(er)且越(yue)(yue)來(lai)(lai)越(yue)(yue)強(qiang)的(de)(de)(de)噪(zao)聲(sheng)。

室(shi)內噪聲的主要來源：

1.交通運輸噪聲

城(cheng)市(shi)交通(tong)業日(ri)(ri)趨(qu)發(fa)(fa)達，給(gei)人們工(gong)作和生活帶來了便(bian)捷和舒適，同(tong)時也促進了經濟的發(fa)(fa)展。但不(bu)(bu)能(neng)不(bu)(bu)看到(dao)，隨著城(cheng)鄉車(che)輛(liang)的增加，公路(lu)和鐵(tie)路(lu)交通(tong)干線(xian)的增多，機(ji)車(che)和機(ji)動車(che)輛(liang)的噪(zao)(zao)(zao)聲(sheng)(sheng)已成了交通(tong)噪(zao)(zao)(zao)聲(sheng)(sheng)的元(yuan)兇，占城(cheng)市(shi)噪(zao)(zao)(zao)聲(sheng)(sheng)的75%。據統計表明，北京是世界有名的噪(zao)(zao)(zao)聲(sheng)(sheng)污染(ran)城(cheng)市(shi)。雖然城(cheng)市(shi)車(che)輛(liang)不(bu)(bu)及日(ri)(ri)本的十分之一， 噪(zao)(zao)(zao)聲(sheng)(sheng)程度卻比日(ri)(ri)本高出1倍。特(te)別是一些臨街的建筑(zhu)，受(shou)害極(ji)重。

2.工業機械環境(jing)噪聲(sheng)

這(zhe)也是室內(nei)噪聲污染(ran)的(de)主要來源。由于(yu)各種動力機、工作機 做功時產生(sheng)的(de)撞擊、摩(mo)擦、噴射以及振(zhen)動，可產生(sheng)七八(ba)十分貝以上(shang)(shang)的(de)聲響(xiang)。這(zhe)些聲 響(xiang)，像紡織(zhi)車間(jian)、鍛壓車間(jian)、粉碎車間(jian)和(he)鋼(gang)廠、水(shui)泥廠、氣(qi)泵房(fang)、水(shui)泵房(fang)都(dou)比較嚴(yan) 重，雖(sui)然都(dou)做了(le)一(yi)定(ding)程(cheng)度的(de)降噪處理，但仍然不能從(cong)根(gen)本上(shang)(shang)消(xiao)除機器本體上(shang)(shang)所產生(sheng) 的(de)噪聲。

3.建(jian)筑施工噪聲(sheng)

建筑施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)噪聲是(shi)在工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)程建設實施階段，包括基(ji)礎工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)程工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)、主體(ti)結構施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)、屋面工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)、裝飾工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)程施工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)所(suo)產生的噪聲(已竣(jun)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)交付使用(yong)的住宅樓進行室內裝修活動除(chu)外)

噪聲分為晝間(jian)(jian)噪聲和(he)夜間(jian)(jian)噪聲

晝間噪(zao)聲(sheng)時間：指6：00到22：00之間的時段

夜間(jian)噪聲時(shi)間(jian)：指(zhi)22：00到(dao)次日6：00之間(jian)的時(shi)段