Reducing pollution by things like sulphates has been the goal of clear-air legislation around the world for decades, and finding a downside now would not be helpful.

几十年世界上用类似硫酸盐的物质来减少空气污染、净化全球空气早有立法，而当前寻找一条下坡路来走完全没有意义。

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In South Africa, as in many developing and newly industrialized countries, legislation on air pollution has failed to keep pace with mushrooming industries.

同许多发展中国家和新兴工业化国家一样，在南非，关于空气污染的立法未能跟上迅速发展的工业的速度。

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Insure that light of around is air-vent, don't violate any fire precautions legislation.

确保本产品周围通风口，该灯使用不能违反任何防火法规。

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America's clean-air legislation is a help, but Ballard has also wisely sought to recruit industrial partners which have a stake in the old technology.

ECONOMIST: Fuel cells: Intel on wheels | The

The researchers were also able to see a rise in temperatures after 1970 - the consequence of clean air legislation cutting emissions of soot and sulphates.

BBC: Particles from fossil fuels 'affect the growth of corals'

While the Kochs have long attracted the ire of liberal activists for underwriting the Tea Party and trying to kill clean air legislation, this was the first time one of their summits was greeted by a protest rally.

FORBES: Inside Today's Koch Brothers 'Billionaires Caucus'