哪种口罩防雾霾,我们需要仔细甄别
<p><span word="When">When</span> <span word="smog">smog</span> <span word="descends">descends</span> <span word="on">on</span> <span word="Beijing">Beijing</span> <span word="or">or</span> <span word="other">other</span> <span word="Asian">Asian</span> <span word="cities">cities</span>, <span word="people">people</span> <span word="rush">rush</span> <span word="to">to</span> <span word="buy">buy</span> <span word="face">face</span> <span word="masks">masks</span>.</p><p>当雾霾降临到北京等亚洲城市的上空时，人们争相购买口罩。</p><p><span word="But">But</span> <span word="how">how</span> <span word="effective">effective</span> <span word="are">are</span> <span word="the">the</span> <span word="masks">masks</span> <span word="at">at</span> <span word="filtering">filtering</span> <span word="out">out</span> <span word="tiny">tiny</span>, <span word="harmful">harmful</span> <span word="particles">particles</span> <span word="of">of</span> <span word="pollution">pollution</span>?</p><p>可是，在过滤微小的有害颗粒物方面，这些口罩究竟有多少效果呢？</p><p><span word="The">The</span> <span word="effectiveness">effectiveness</span> <span word="varies">varies</span> <span word="tremendously">tremendously</span>, <span word="depending">depending</span> <span word="on">on</span> <span word="factors">factors</span> <span word="like">like</span> <span word="type">type</span>, <span word="brand">brand</span> <span word="and">and</span> <span word="fit">fit</span>. <span word="Simple">Simple</span>, <span word="loosefitting">loosefitting</span> <span word="masks">masks</span> <span word="do">do</span> <span word="little">little</span> <span word="to">to</span> <span word="combat">combat</span> <span word="pollution">pollution</span>, <span word="according">according</span> <span word="to">to</span> <span word="the">the</span> <span word="United">United</span> <span word="States">States</span> <span word="Food">Food</span> <span word="and">and</span> <span word="Drug">Drug</span> <span word="Administration">Administration</span>, <span word="whereas">whereas</span> <span word="more">more</span> <span word="advanced">advanced</span>, <span word="government">government</span>-<span word="approved">approved</span> <span word="respirators">respirators</span> <span word="that">that</span> <span word="bind">bind</span> <span word="tightly">tightly</span> <span word="to">to</span> <span word="the">the</span> <span word="wearer">wearer</span>'<span word="s">s</span> <span word="face">face</span> <span word="can">can</span> <span word="help">help</span> <span word="but">but</span> <span word="may">may</span> <span word="be">be</span> <span word="uncomfortable">uncomfortable</span>. <span word="More">More</span> <span word="public">public</span> <span word="education">education</span> <span word="and">and</span> <span word="research">research</span> <span word="are">are</span> <span word="urgently">urgently</span> <span word="needed">needed</span> <span word="about">about</span> <span word="face">face</span> <span word="masks">masks</span>, <span word="health">health</span> <span word="professionals">professionals</span> <span word="say">say</span>.</p><p>基于类型、品牌和贴合度等因素，它们的有效性千差万别。美国食品与药品管理局(<span word="United">United</span> <span word="States">States</span> <span word="Food">Food</span> <span word="and">and</span> <span word="Drug">Drug</span> <span word="Administration">Administration</span>)称，松垮地戴在脸上的简单口罩在对抗污染上起不到什么作用，而如果是获政府审批的更为先进的呼吸防护罩紧贴在面部，则能起到作用，但或许不太舒适。卫生领域的专业人士称，在口罩方面亟需加强公众教育与研究。</p><p>"<span word="Consumers">Consumers</span> <span word="simply">simply</span> <span word="just">just</span> <span word="don">don</span>'<span word="t">t</span> <span word="know">know</span> <span word="which">which</span> <span word="of">of</span> <span word="those">those</span> <span word="masks">masks</span> <span word="are">are</span> <span word="the">the</span> <span word="best">best</span>," <span word="Richard">Richard</span> <span word="Saint">Saint</span> <span word="Cyr">Cyr</span>, <span word="a">a</span> <span word="physician">physician</span> <span word="in">in</span> <span word="Beijing">Beijing</span> <span word="who">who</span> <span word="writes">writes</span> <span word="a">a</span> <span word="health">health</span> <span word="column">column</span> <span word="for">for</span> <span word="the">the</span> <span word="Chinese">Chinese</span>-<span word="language">language</span> <span word="T">T</span> <span word="Magazine">Magazine</span> <span word="once">once</span> <span word="a">a</span> <span word="month">month</span>, <span word="said">said</span> <span word="in">in</span> <span word="an">an</span> <span word="email">email</span>. "<span word="And">And</span> <span word="some">some</span> <span word="indeed">indeed</span> <span word="may">may</span> <span word="be">be</span> <span word="worse">worse</span> <span word="than">than</span> <span word="helpful">helpful</span> <span word="if">if</span> <span word="people">people</span> <span word="are">are</span> <span word="falsely">falsely</span> <span word="reassured">reassured</span> <span word="and">and</span> <span word="spend">spend</span> <span word="more">more</span> <span word="time">time</span> <span word="outside">outside</span> <span word="using">using</span> <span word="a">a</span> <span word="mask">mask</span> <span word="which">which</span> <span word="doesn">doesn</span>'<span word="t">t</span> <span word="work">work</span>."</p>
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