Air Purifiers

I have been sneezing, having watery, itchy, red eyes, stuffy nose, and running nose for weeks now. It goes away most of the time when I’m in school but when I come home, all those symptoms starts happening. It could be the air that I’m breathing at home. Would an air purifier help at all? I’m also taking a generic brand of Claritin-D which doesn’t seem to help that much.

I recently moved into a dorm and the first thing i noticed was it smelled musty. It's virtually on basement level, faces north, and the grass is always damp. I wake up after a couple hours with a stuffy nose, red eyes, and aches. Also, could an ionic breeze filter out mold? Any suggestions on how to deal with problem would be great help.