Why dont polluted cities build giant ionic air purifier to remove the haze you see in every city?

My suggestion to air improvement is to build giant ionic air purifier that resembles a long pole maybe 1000 ft high by 100ft wide. Erect 4 in each corner and 1 in the center of the city and turn in on so it can attract all the carbon particles that hangs above the city. Then we can compact all the particles into a canister, put it on a rocket and send it on a one way trip to the moon or the sun. I figure an ionic air purifier can purify the air in a room, why not apply the same priciples on a larger scale like to clean the city air. Does this make sense to anybody?