Clean air cycle.

Designer Daan Roosegaarde is on a mission to fight pollutants. Following its first Smog Free Tower, his latest concept is the Smog Free Bicycle. And, yes, bikes are always emission free but his bicycle would “inhale” polluted air and then envelop the cyclists in a bubble of fresh oxygen when “exhaling”.
dezeen.com, studioroosegaarde.net (smog free project)