Being a resident of Delhi bought this air purifier about 10 days ago. I presume it would be useful as it filters particulate matter from the air.
The concept of Plasmacluster ions is not understood well by me or it could just be a marketing gimmick. However of the brands I looked at viz Panasonic, Philips and Sharp I found that for the same features cost of Sharp was less.
Additionally it had this Plasmacluster feature thrown in. have been using it off and on and the unit works fine. elegant, light weight - easy to move around. fits in with the general decor of the living room. However the cost is exhorbitant. I paid Rs13400.00 online. However the package should not cost more than 5K. Hope with increasing competition prices would come down.