疫情期间封城 欧洲多国空气污染水平大幅下降
<p>为控制新冠肺炎疫情的蔓延，多国采取封锁措施，民众无必需不得外出，交通流量大幅减少，这使得空气污染水平出现大幅下降。伦敦的<span word="PM">PM</span>2.5水平约为往年同期正常水平的一半。</p><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>
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