北京隔音窗公司青戎隔音窗詳解噪音降至40分貝左右是什么概念：
     科(ke)學(xue)有效家(jia)曾測(ce)試(shi)過(guo)(guo)，人耳快(kuai)要能(neng)發(fa)出(chu)說(shuo)話(hua)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)的(de)(de)(de)(de)說(shuo)話(hua)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)是(shi)(shi)(shi)0至10聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)，電(dian)子手(shou)表聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)、枯葉的(de)(de)(de)(de)咝咝聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)是(shi)(shi)(shi)20聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)，兩個人的(de)(de)(de)(de)輕音耳語是(shi)(shi)(shi)30聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)，似(si)的(de)(de)(de)(de)新房裝修居室里的(de)(de)(de)(de)說(shuo)話(hua)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)是(shi)(shi)(shi)45聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)，公(gong)開汽車(che)的(de)(de)(de)(de)異響、喧囂的(de)(de)(de)(de)城市內的(de)(de)(de)(de)說(shuo)話(hua)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)是(shi)(shi)(shi)80至90聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)，而(er)織布機生產(chan)加(jia)工不(bu)遠低(di)于(yu)100聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)，噴氣式航(hang)班的(de)(de)(de)(de)說(shuo)話(hua)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)高至120至140聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)。中醫(yi)藥學(xue)上會認為(wei)超過(guo)(guo)了(le)60聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)貝(bei)(bei)(bei)(bei)的(de)(de)(de)(de)說(shuo)話(hua)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)是(shi)(shi)(shi)噪(zao)聲(sheng)(sheng)(sheng)(sheng)(sheng)(sheng)污染。