求翻译：从世界范围看，交通运输是碳排放的主要领域之一，而且发达国家道路运输业排放的二氧化碳所占比重高于世界平均水平。西方发达国家城市的大气污染，主要是因为汽车排放及其相关产物。我国城市化进程加快，城市空气污染仍以烟煤型为主，但机动车排放污染已越来越威胁着城市空气质量。我国城市由于机动车的排放标准低，燃料的消耗大，所以由城市交通所造成的大气污染远比国外城市严重。汽车排放污染物主要是一氧化碳（ＣＯ），碳氢化合物（ＨＣ），氮氧化合物（ＮＯｘ），颗粒物（ＰＭ）以及光化学烟雾产物（Ｏ３）等。近年来，汽车尾气的排放越来越成为大气质量恶化的主要原因。是什么意思？

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From a global perspective, traffic and transport carbon emissions is one of the main areas of developed countries, and road transportation emissions of carbon dioxide by 2 percentage higher than the world average. The developed countries of the west city air pollution, mainly because emissions from

Looking from the worldwide scale that, the transportation is one of carbon emissions main domains, moreover the developed country path shipping industry emissions carbon dioxide accounts for the proportion to be higher than the world average level.The western developed country city air pollution, ma

From a global perspective, transport is one of the main areas of carbon emissions, and developed countries the share of road transport emissions of carbon dioxide is higher than the world average. Urban air pollution in Western developed countries, mainly due to vehicle emissions and its related pro

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