I've seen others talk about this within the last month.   They thing that I shake my head at is this also goes along with vertical farming.   It is not a new thing and this Architect is not even really inventing something that others had not proposed.   It is good that someone is finally doing something, but this is a cool idea that people have been talking out for many years now.

Though a lot of the vertical farm proposals were substantially more involved than it takes to do what is being done here and they were aiming for addressing food problems more than air pollution though in reality it could achieve both.