Odd odor in '98 Legacy

The past week or so, I got this strange odor in my 1998 Subaru Legacy. It is a chemical like odor...almost smells like bondo. Seems to be coming from the front. I can smell it from the outside also, and through the vents. Could this be a small exhaust leak somewhere? Also, I have not had a chance to check the car when it is completely dry as it has rain like crazy here in Maine almost non-stop the past 10 days or so. Once it drys out, I plan to check underneath. Anyways, it really isn't like a carbon dioxide odor, but more like a bondo smell....the stuff used to patch cars. That is what it reminds me of. Any comments appreciated.