1. CHANGE LITTER TYPE
The type of litter you use can play a very important role in odor control. The rule is one litter box per cat in the household. So you can test litters by using different brands and textures in different boxes and assess how they work in masking odors. Clay-based clumping litters often have better odor blockers than the more eco-friendly litters, such as those made from newspapers.
While many litters of all varieties do have built-in odor eliminators that include baking soda, along with some new formulations on the market, it's important to remember that cats typically don't like strongly scented litters and this could result in their staying clear of the litter box altogether! So read labels and look for odor blockers that are, in fact, odorless.