Artist Matt Hope outfitted his bicycle with an air filtration system that allows him to breathe clean air as he bicycles around Beijing. It's his way of drawing attention to Beijing's pollution woes. Though he says it could also be seen as "a ridiculous solution to a ridiculous problem."
It reminds me of Hana Marie Newman's oxygen-tank bubble dress that I posted about a few months ago. Hope and Newman should get together. They could swap air purifiers.
I have no idea who this guy is, but his performance is impressive for his age. The youtube info only says that he's a performer in Nuremberg's Christkindlesmarkt. The video was uploaded in December 2006.