If you happen to have a basement or closed room without any ventilation, then you badly need a basement dehumidifier. It will help you with the nasty odor in your basement.
In my old work, I was assigned to an area for a little while. I need to rent a place for a couple months for that assignment. I found a basement room which is so cheap and take it, little do I know that their dehumidifier is broken and was stuck for days on the unwanted smell. Good thing the owner took action and fixed it right away.