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鷺島再陷“霾伏”

發(fā)布時(shí)間：2014-11-08 06:29:33 來(lái)源：廈門(mén)日?qǐng)?bào) 作者：佚名責(zé)任編輯：羅伯特

　　本報(bào)訊（記者沈彥彥通訊員林江濱）寒風(fēng)終于吹來(lái)了冬的氣息。昨日氣溫明顯下降，與冷空氣相呼應(yīng)的還有灰蒙蒙的天色——?dú)鉁叵陆?，空氣質(zhì)量也下降。昨日，廈門(mén)的空氣質(zhì)量指數(shù)(AQI)實(shí)時(shí)數(shù)據(jù)為62，空氣質(zhì)量?jī)H為“良”，首要污染物仍為PM10。

　　為什么氣溫下降會(huì)帶來(lái)空氣質(zhì)量下降？環(huán)保專家認(rèn)為，PM10的主要來(lái)源是揚(yáng)塵污染。冷空氣來(lái)襲，使混合層厚度下降，制約了大氣污染物在垂直方向上的擴(kuò)散稀釋能力。

　　高樓多成為影響空氣質(zhì)量的“元兇”，近年來(lái)，廈門(mén)的年平均風(fēng)速呈下降趨勢(shì)，大氣污染物的水平擴(kuò)散能力不斷下降，且近十幾年以來(lái)處于較低水平。此外，車輛多也影響了空氣質(zhì)量。

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