Carbon filter is your best bet. Lots of DIY threads on how to make/implement one. Suggesting you make one if you're really on a budget. For the most part the activated carbon you can get from Wally World and similar works well.
Usually for less than $20-30 US you can get filtration in place.
Imo a carbon filter is a necessity. i have one and an ozone generator (Crystal Air brand). I will not be without both: the filter to handle the grow area, the ozone to handle all kinds of odors, from trimming a tableful of weed all the way to "wow, my body sure does hate Taco Bell". cn
Wat about fans wit ioniozer... Still tryin to figure out how to run ventalation.... Where to place outake and intake.,im in an apartment cant modify much.