Pulse of emissions regulations for diesel engines is analysed. The study is carried out on the emissions level that can be reached up by diesel engine.

对柴油机排放法规的动向进行了分析，对柴油机可能达到的排放水平进行了研究，重点论述了柴油机排气后处理技术；

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The research results show that this method can simulate the practical condition well and it also indicates a way to improve emissions level and performance of automobile diesel engine.

结果表明，该方法能较好地拟合实际情况，为改善发动机的排放和性能指明了方向。

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If current trends continue, by the year 2010 carbon emissions in the United States will soar to a level more than one-third higher than were those in 1990, according to official projections.

根据官方预测，照目前的趋势，到2010年，美国的碳排放将飙升至比1990年高出三分之一以上的水平。

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So that's an equivalent of a return to 1990 level of emissions.

这相当于是回到1990年的排放水平。

对全球变暖的政策 - SpeakingMax英语口语达人

Only now will we have the socially optimal level of emissions, the level which provides the greatest amount of human happiness possible.

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In London, Picarro will place analyzers on the ground around the city as well as one on a bus to measure carbon emissions at road level and another on a plane to gauge emissions at higher altitudes.

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For instance, eight Northeastern states are developing an initiative setting state-level emissions caps and establishing a trading program.

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