One way to improve the smell of your basement is to open up the windows and doors to let fresh air in. Another strategy would be to disperse a few bowls of baking soda throughout the basement.
Baking soda is well-known for its ability to eliminate unpleasant scents and maintain a pleasant, odor-free environment in a place. Finally, be sure to keep the space clean and clutter-free, as this will help to prevent musty odors from taking over.