OK, did some serious stovetop cooking tonight. The kitchen air purifier DEFINITELY made a difference.
Let me clarify: my stove has a hood. It just isn't vented outside. And, although it does a lot of good, it doesn't do ENOUGH. There's always smoke pervading the rooms next to my kitchen.
But not tonight. The kitchen purifier clarified the air going into the other rooms. Although the purifiers in the two contiguous rooms were still going on 10, there wasn't this cloud of greasy smoke pervading that end of my apartment.