空气污染知多少:细数5大空气污染源
<p>1. <span word="Power">Power</span> <span word="Generation">Generation</span></p><p>1. 发电污染</p><p><span word="Siting">Siting</span> <span word="fossil">fossil</span> <span word="fuel">fuel</span> <span word="power">power</span> <span word="stations">stations</span> <span word="in">in</span> <span word="mainly">mainly</span> <span word="rural">rural</span> <span word="areas">areas</span> <span word="and">and</span> <span word="distributing">distributing</span> <span word="the">the</span> <span word="pollution">pollution</span> <span word="produced">produced</span> <span word="more">more</span> <span word="evenly">evenly</span> <span word="via">via</span> <span word="tall">tall</span> <span word="chimneys">chimneys</span> <span word="has">has</span> <span word="resulted">resulted</span> <span word="in">in</span> <span word="improved">improved</span> <span word="urban">urban</span> <span word="air">air</span> <span word="quality">quality</span>, <span word="though">though</span> <span word="they">they</span> <span word="still">still</span> <span word="remain">remain</span> <span word="a">a</span> <span word="major">major</span> <span word="source">source</span> <span word="of">of</span> <span word="pollution">pollution</span>, <span word="mainly">mainly</span> <span word="sulphur">sulphur</span> <span word="dioxide">dioxide</span> <span word="and">and</span> <span word="nitrogen">nitrogen</span> <span word="oxides">oxides</span>.</p><p>将化石燃料发电站建在郊区，造高烟囱让污染物更平均地分布在各处，这些当然能让城市的空气变得更好。不过，发电依旧是一个很大的污染源，主要的污染物是二氧化硫和一氧化氮。</p><p><span word="Better">Better</span> <span word="dispersion">dispersion</span> <span word="of">of</span> <span word="pollutants">pollutants</span> <span word="emitted">emitted</span> <span word="by">by</span> <span word="tall">tall</span> <span word="chimneys">chimneys</span> <span word="leads">leads</span> <span word="to">to</span> <span word="better">better</span> <span word="dilution">dilution</span> <span word="in">in</span> <span word="the">the</span> <span word="air">air</span> <span word="and">and</span> <span word="thus">thus</span> <span word="lower">lower</span> <span word="local">local</span> <span word="concentrations">concentrations</span> <span word="of">of</span> <span word="pollutants">pollutants</span>. <span word="This">This</span> <span word="has">has</span> <span word="however">however</span> <span word="led">led</span> <span word="to">to</span> <span word="pollution">pollution</span> <span word="being">being</span> <span word="dispersed">dispersed</span> <span word="more">more</span> <span word="widely">widely</span> <span word="and">and</span> <span word="to">to</span> <span word="transboundary">transboundary</span> <span word="air">air</span> <span word="pollution">pollution</span>.</p><p>高的烟囱能够让污染物在空气中散布得更均匀，可以更好地稀释污染物，让污染物的浓度降低。然而，这却致使污染物分布得更广泛，并且会使空气污染向其他区域传播。</p><p>2. <span word="Other">Other</span> <span word="Industry">Industry</span> <span word="and">and</span> <span word="waste">waste</span> <span word="disposal">disposal</span></p><p>2. 其他工业和废物污染源</p><p><span word="Although">Although</span> <span word="fossil">fossil</span> <span word="fuel">fuel</span> <span word="power">power</span> <span word="plants">plants</span> <span word="are">are</span> <span word="the">the</span> <span word="major">major</span> <span word="source">source</span> <span word="of">of</span> <span word="industrial">industrial</span> <span word="air">air</span> <span word="pollution">pollution</span> <span word="in">in</span> <span word="many">many</span> <span word="countries">countries</span>, <span word="all">all</span> <span word="industry">industry</span> <span word="and">and</span> <span word="many">many</span> <span word="businesses">businesses</span>, <span word="large">large</span> <span word="and">and</span> <span word="small">small</span>, <span word="can">can</span> <span word="be">be</span> <span word="significant">significant</span> <span word="local">local</span> <span word="sources">sources</span> <span word="of">of</span> <span word="a">a</span> <span word="wide">wide</span> <span word="range">range</span> <span word="of">of</span> <span word="air">air</span> <span word="pollutants">pollutants</span>.</p><p>虽然化石燃料发电站是很多国家最主要的工业造成的空气污染，但是所有工业以及其他很多行业，无论大小，都有可能成为当地各种类型空气污染的源头。</p>
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