Fine particulate pollution and ozone from vehicle exhaust emissions have been linked to about 385,000 premature deaths per year globally. Placing roads underground would almost eradicate vehicle pollution on the surface, with big impacts on air quality, but this pollution would be simply transferred elsewhere. "You really have to put a lot of thought into ventilation in those spaces so that you don"t end up with a rather apocalyptic scenario," Garrett says. 

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