China: "Yes, very good. We'll take them." UTEC: "How many exactly?" China: "All of them." UTEC: "You mean..." China: "Yes, every single one. We'll pay double if we have to."

I'd like to see them install one of these in a large Chinese city, but I'll bet they'd have to clean the sludge filters fairly often.

Sell the sludge to algae fuel farms. Make it so that there is an economically viable income off it and it will be everywhere in the world overnight.

I think if we could power it with solar panel or wind turbines, this billboard could be one of the cleanest and greenest thing on earth

Seriously, I see them making their way to China.

This would be the ruin of the world if it actually works as advertised and if it ends up being implemented on a grand scale.
Human nature being what it is, people would take this as a free pass to lay waste to whatever forrested areas remain since this one billboard replaces 1200 trees.
Wtih that said, I seriously doubt that this works as promised. It seems too good to be true, much like the eve elusive perpetual motion machine.

China needs to have this ASAP !!!

I think electrostatic filters would use less energy but they might need more maintenance.
@ Joel Detrow That would involve someone with power in the PRC caring.

Don't worry. I'm sure Chinese hackers are now findng their way into UTEC Peru's servers to steal the designs. China will soon be flooding the market with their "own" air purifying billboards. Xie xie!

to layman like me the bill board sure is very very misleading 'O2' ..... seriously thought something like artificial photosynthesis. ends up to be a giant dust remover or vacuum cleaner for air