How do you judge to what extent air has been purified? do we have any authority who will tell us the air quality before and after installing this or any other purifier? pl help.Has anyone heard of purifiers launched by Sharp India Ltd, besides purification they also come with an advantage of PLASMA CLUSTER ION GENERATION, A techonology patented by SHARP and being sold all over the world.this product is effective against swine flu(99.9%) chicken guniya, all types of viruses and bacterias.tested and certified in most reputed instutions all over the world.pl correct .however this product has not been advertised in india