Focus Beijing is booming, but talent is leaving due to bad air

The horrifyingly bad air in Beijing is driving something of an expat exodus - as well as one by young Chinese executive types. The past three months have seen the worst air quality on record. 

Kim Kyung-Hoon/Reuters

Some days it is so thick that you can scarcely see across the street. Other days its acrid smell catches at the back of your throat. More than one day in two in recent months, it has been officially unsafe to go outside without a face mask.