Startup Idea : control air pollution - air purification

there is an increasing amount of air pollution in the atmosphere, a major contributing source being automobiles, and another being dusts of various kind, leading us to the use of air purifiers at home, but if we think of reducing the air pollution at a larger scale, lets say around your house and neighbourhood, an effective system called Cyclone can be used, reference: http://www.britannica.com/technology/cyclone-technology..... taking the same principle to be used for a city level pollution clean up, huge skyscraper modules can be setup that purifies the air, this way cities like delhi, mumbai which have an alarming pollution index can control their levels.the skyscraper module can be designed the way Cyclone is with additional air purification techniques, like charcoal mesh (adsorbent), various filters and wet scrubbers, in a massive scale and even the residue collected can be solidified by binding materials and used for various purposes such as construction raw material, or other crafty ideas for aesthetics. new innovative methods to reuse can be found...