北京发布最新一轮PM2.5源解析 主要来自机动车
<p>5月14日，北京市发布了新一轮的细颗粒物（<span word="PM">PM</span>2.5） <span word="Coal">Coal</span> <span word="burning">burning</span> <span word="is">is</span> <span word="no">no</span> <span word="longer">longer</span> <span word="a">a</span> <span word="major">major</span> <span word="source">source</span> <span word="of">of</span> <span word="PM">PM</span>2.5 <span word="in">in</span> <span word="Beijing">Beijing</span>, <span word="while">while</span> <span word="car">car</span> <span word="emissions">emissions</span> <span word="have">have</span> <span word="become">become</span> <span word="the">the</span> <span word="top">top</span> <span word="cause">cause</span>, <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="study">study</span> <span word="released">released</span> <span word="by">by</span> <span word="Beijing">Beijing</span>'<span word="s">s</span> <span word="environment">environment</span> <span word="watchdog">watchdog</span> <span word="Monday">Monday</span>.</p><p>北京市环保局周一发布的研究结果显示，燃煤不再是北京细颗粒物（<span word="PM">PM</span>2.5）的主要<span word="PM">PM</span>2.5 现阶段本地排放贡献中，移动源（<span word="mobile">mobile</span> <span word="sources">sources</span>）、扬尘源（<span word="dust">dust</span>）、工业源（<span word="industrial">industrial</span> <span word="sources">sources</span>）、生活面源（<span word="living">living</span>-<span word="related">related</span> <span word="sources">sources</span>）和燃煤源（<span word="coal">coal</span> <span word="consumption">consumption</span>）分别占45%、16%、12%、12%和3%，农业及自然源（<span word="agricultural">agricultural</span> <span word="and">and</span> <span word="natural">natural</span> <span word="sources">sources</span>）等其他约占12%。燃煤基本退出北京大气<span word="PM">PM</span>2.5主要贡献源的行列。</p><p>移动源主要包括柴油车（<span word="diesel">diesel</span> <span word="vehicles">vehicles</span>）、汽油车（<span word="petrol">petrol</span> <span word="vehicles">vehicles</span>）、进京及过境柴油车（<span word="diesel">diesel</span> <span word="vehicles">vehicles</span> <span word="entering">entering</span> <span word="or">or</span> <span word="passing">passing</span> <span word="Beijing">Beijing</span>）、非道路机械（<span word="non">non</span>-<span word="road">road</span> <span word="machinery">machinery</span>）、航空（<span word="airplanes">airplanes</span>）、火车（<span word="trains">trains</span>）等等。</p><p>移动源中，在京行驶的柴油车贡献最大，扬尘源中，建筑施工（<span word="construction">construction</span> <span word="dust">dust</span>）和道路扬尘（<span word="road">road</span> <span word="dust">dust</span>）并重，工业源中，石油化工（<span word="petrochemical">petrochemical</span> <span word="industry">industry</span>）、汽车工业（<span word="automobile">automobile</span> <span word="industry">industry</span>）和印刷（<span word="printing">printing</span>）等排放挥发性有机物工业行业的贡献较为突出，生活面源中，生活溶剂使用等约占四成。</p><p>此次公布的源解析研究称，区域传输占26%-42%，约三分之一。</p>
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