Carpet mold question

In the last week or so, I’ve noticed an odd odor in my apartment - at first it smelled vaguely like something was rotting. My girlfriend stopped by the other day and immediately said it smelled like carpet mold. I don’t see any evidence, but the carpeting is a darkish gray that might conceal visible evidence of molds. Is there a fairly simple way to un-mold-ify the carpeting?

There are mold test kits you can buy at hardware stores. That might be a place to start. If you have mold in carpet to the extent it’s generating a pervasive odor, I don’t imagine it will be an easy fix. It would, however, be likely to be something your landlord would have to fix. Specific legal requirements probably vary locally.