欧洲多国空气污染水平大幅下降
<p><span word="The">The</span> <span word="level">level</span> <span word="of">of</span> <span word="air">air</span> <span word="pollution">pollution</span> <span word="in">in</span> <span word="London">London</span>, <span word="Rome">Rome</span>, <span word="Milan">Milan</span> <span word="and">and</span> <span word="Paris">Paris</span> <span word="has">has</span> <span word="fallen">fallen</span> <span word="sharply">sharply</span> <span word="since">since</span> <span word="coronavirus">coronavirus</span> <span word="lockdown">lockdown</span> <span word="measures">measures</span> <span word="have">have</span> <span word="forced">forced</span> <span word="people">people</span> <span word="indoors">indoors</span> <span word="and">and</span> <span word="off">off</span> <span word="the">the</span> <span word="roads">roads</span>.</p><p>因新冠肺炎疫情封锁措施，多地民众被迫待在家中，不再上街，伦敦、罗马、米兰和巴黎的空气污染水平大幅下降。</p><p><span word="Levels">Levels</span> <span word="of">of</span> <span word="particulate">particulate</span> <span word="matter">matter</span>, <span word="which">which</span> <span word="can">can</span> <span word="come">come</span> <span word="from">from</span> <span word="road">road</span> <span word="transport">transport</span> <span word="and">and</span> <span word="burning">burning</span> <span word="fuel">fuel</span>, <span word="as">as</span> <span word="well">well</span> <span word="as">as</span> <span word="nitrogen">nitrogen</span> <span word="dioxide">dioxide</span>, <span word="which">which</span> <span word="comes">comes</span> <span word="primarily">primarily</span> <span word="from">from</span> <span word="vehicle">vehicle</span> <span word="exhausts">exhausts</span>, <span word="are">are</span> <span word="low">low</span> <span word="across">across</span> <span word="London">London</span>.</p><p>在伦敦，来自公路运输和燃料燃烧的颗粒物，以及主要来自汽车尾气的二氧化氮的含量都很低。</p><p><span word="The">The</span> <span word="UK">UK</span> <span word="capital">capital</span>'<span word="s">s</span> <span word="levels">levels</span> <span word="of">of</span> <span word="ultra">ultra</span>-<span word="fine">fine</span> <span word="particulate">particulate</span> <span word="matter">matter</span>, <span word="known">known</span> <span word="as">as</span> <span word="PM">PM</span>2.5, <span word="are">are</span> <span word="currently">currently</span> <span word="around">around</span> <span word="half">half</span> <span word="that">that</span> <span word="would">would</span> <span word="be">be</span> <span word="normally">normally</span> <span word="recorded">recorded</span> <span word="at">at</span> <span word="this">this</span> <span word="time">time</span> <span word="of">of</span> <span word="year">year</span>.</p><p>目前，伦敦的超细颗粒物（<span word="PM">PM</span>2.5）水平约为往年同期正常水平的一半。</p>
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