There are lots of ways beyond a box of baking soda to combat odors. Vanilla extract will also keep your fridge fresh. Soak a cotton ball or paper towel, put it on a paper plate and wait for it to dry before removing. Or use a product like Fridge Refresh or Odor Magic Filters.
To help keep your fruits, vegetables and herbs fresher longer, consider specially designed Produce and Herb Keepers. These containers work in three ways to keep foods fresh.