Plants in general help purify the air. But unfortunately, most house plants (or those better suited to low light) don’t really have a strong scent. Seeing as my own bedroom has turned into a greenhouse as I can’t plant much outside as I live in a desert. I can tell you that the air in my room smells the best—cleaner—but it’s also mighty humid. I say if you really want a distinct smell, use perfumes oils or a candle but putting a plant or two inside is always a good idea.