Want to pedal your way to work but scared of what youre breathing in? Sick of smog spewing in your face while you cycle? Bangkok-based design firm Lightfog could have the bike for you — or at least theyre planning on building a prototype soon. Lightfogs idea for an environmentally-friendly Air Purifier bike incorporates an air filter into a bikes handlebars, filtering out air pollution and emissions from those messy cars and pushing clean air back to the rider. …