The new ultra-low emission zone (Ulez) is likely to be a big issue in next year's mayoral election.

“超低排放新区（Ulez）”很可能是明年伦敦市长选举的重大议题。

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In the Olympic Green, no emission or ultra-low emission vehicles will be used.

奥林匹克公园内采用零排放车辆和超低排放车辆。

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Ultra-low sulfur diesel fuel is highly refined for clean, complete combustion and low emission enabling the use of emissions treatment systems.

超低硫柴油是通过精炼的清洁，可完全燃烧的低排放燃油，它为排放控制装置的使用创造了条件。

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While diamond lane access ended for solo drivers of low-emission vehicles, it continues for solo drivers of ultra-low-emission vehicles.

FORBES: Diamond Lanes: Another Failed Energy / Environmental Policy

On Wednesday he announced his vision to see the world's first "Ultra Low Emission Zone", meaning by 2020 only zero or low-emission cars would be allowed into central London.

BBC: Has London's congestion charge worked?