Author here, this is just my take on why air purifiers are so important and very soon should and will become standard home appliances.
For sure, I got a couple Dysons though I ended up making my own using a industrial vacuum HEPA filter and a 12v blower fan.
DYSON: $500
Self made: ~$70
I did the same thing! Started with an expensive dyson, then bought a chepo online then last one is a big home filter on a box fan. I think the box fan is a little slower but works 90% as well.