[header] How to make a baking soda air freshener [title] Combine the baking soda and essential oil. [step] Add 1 tablespoon (14 g) of baking soda to a small bowl or dish. Mix 5 to 6 drops of an essential oil into the baking soda with a spoon until they are well combined. 
[substeps] You don't necessarily have to add an essential oil to the air freshener. The baking soda will absorb odors to help freshen the air on its own.