More than half of U.S. coal generators lack postcombustion NOx pollution controls.

超过一半的美国煤炭发电机缺乏二次燃烧氮氧化物污染控制。

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Professor Boehman would like to see more research done so we can know for sure if (and how much) additional NOx pollution is caused by the use of nitrogen-enriched gasoline.

铂尔曼教授还表示，他希望看到更多的研究，以明确添氮汽油的使用到底会产生多少氮氧化物。

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The research on NOX removal from flue gas is becoming a hot issue of air pollution control presently.

烟气脱氮技术的研究已成为目前大气污染控制中的一个热点课题。

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This interacts with the NOX and SOX to produce the dangerously small particulate pollution that leads to premature deaths.

ECONOMIST: Planes and pollution