The end result is an increased fuel efficiency of up to 70-80% as well as a cleaner engine and smog-free exhaust.

最终的结果是提高燃料的效率高达70-80％，以及发动机和烟雾清洁无废气。

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It's an air cleaning machine connected to a bicycle and is part of the Smog Free Project.

这是一台连接到自行车上的空气净化机，是雾霾净化项目的一部分。

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With credits from solar rooftop power, live essentially oil - free of the gasoline pump , free of smog checks, oil changes and tune ups.

采用屋顶太阳能电源，不用汽油泵，不用尾气检查，不用担心机油变化和油标上升。

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A., she argued, had not taken into account that smog-free skies would result in more cases of skin cancer.

NEWYORKER: Covert Operations

They stroll along Ojai Avenue from art gallery to art gallery, enjoying stunning views of the Topa Topa Mountains and breathing in the smog-free air.

FORBES: Magazine Article

Meanwhile, residents are speculating on how the return of clear, blue, smog-free skies to Beijing has coincided with the two sessions, Hong Kong's South China Morning Post observes.

BBC: China media: NPC spokeswoman praised