Such laws in California have cut diesel-soot emissions in that state by half.

在加州，这样的法律已削减该州一半柴油碳烟的排放。

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These capture most of the heat from the fuel, greatly reducing the amount of wood required, and they slash soot emissions too.

这可以获取燃料中的大部分能量，大幅减少所需的木头，还可以减少烟尘排放。

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Diesel engines can produce higher soot emissions due to its diffusion combustion mode and small amounts of fuel additives can improve such process and thereby reduce emissions.

柴油机的扩散燃烧方式会产生较高的烟度排放，在燃油中加入少量的燃油添加剂能够改善燃烧过程降低排放。

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The plasmatron doesn't deal with soot emissions, but ArvinMeritor engineers are hoping to develop by the end of the decade future variants that would.

FORBES: Clearing the Air

It has imposed new clean air standards governing emissions of soot and smog.

CNN: Environmental Legislation Going Nowhere Fast

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'