I found this guide very useful. It breaks https://pacoandpepper.com/blogs/news/best-litter-box-for-smell down why some litter boxes fail at controlling odor and what features to look for, like filters, automatic cleaning, or a closed structure. The tips on baking soda, ventilation, and litter replacement are simple but effective. Makes me think more carefully about both the tray and daily maintenance for a smell-free space.