Matt SteinglassJune 21, 2009 10:04Updated May 30, 2010 11:57
HANOI — It’s hard to find a place in Hanoi where you don’t hear motorbikes.
The city has 1.8 million of the gasoline-powered beasts, roughly one for every two inhabitants. They are the dominant mode of transit, and the source of most of the city’s caustic air pollution. A 2006 study found pedestrians in downtown Hanoi breathe particulate matter levels of almost 500 parts per million, ten times higher than WHO guidelines.
But Christian Okonsky, an engineer from Austin, Texas, has a device that could change all that.