Worth investing in air purifier?
I live in an apartment in the middle of the city. My room gets dusty really easily and I have to dust everyday. I don’t have any allergies or asthma problems. My question is, is it worth investing in a good air purifier ( e.g.> 0, HEPA filtration etc, or is it good enough to buy a cheaper air purifier(0) with no HEPA filtration?

No, just damp dust and fill any gaps around doors and windows to keep the dust out .