To reduce odor, Tidy Cats added the power of Glade Tough Odor Solutions
More about their products: Tidy Cats home page
The Material Safety Data Sheet for the product recommends "remove to fresh air" as first aid for inhalation. Those using the product are urged to "avoid breathing vapors, mist or gas."
The listed active ingredients are Ethyl alcohol and Triethylene Glycol. They claim "All ingredients of this product are listed or are excluded from listing on the U.S. Toxic Substances Control Act Chemical Substance Inventory. That does not mean it's safe.
Material Safety Data Sheet: Glade Fabric & Air Tough Odor Solutions Clear Springs
Material Safety Data Sheet: Triethylene Glycol