Prince, 1 x IQ no matter how big will not do an entire flat, unless your flat is 500sqft. It will definitely improve the air quality, but on a day like yesterday when the PMs exceeded 1,000,000 ( no not a typo ), the air inside your flat will still be above the WHO limit of 60,000, you really need one in every room.
As for A/Cs, most, if not all of them recirculate the inside air so should not be an issue.
When the IQ guy comes around what will knock your socks off ( well it did me ) is how the pollution is just as bad inside your unfiltered flat as it is outside which makes a joke of the government telling us to stay inside on really bad days.
As an aside to that, I have noticed no government warnings recently inspite of readings exceeding 500,000 and yesterday which was over 1,000,000.
