Essential oils can pose a toxic risk to household pets, especially to cats.. Cats are also very sensitive to phenols and phenolic compounds, which can be found in some essential oils. The higher the concentration of the essential oil (i.e. 100%), the greater the risk to the cat.
The aforementioned essential oils are safe for cats, but should still be diluted or diffused. Use them in moderation to maintain a safe environment for your pet. Essential oils are likely more safe for cats than artificial fragrances and air fresheners.
Additionally, very young cats and kittens, and cats with liver disease are more sensitive to their effects. Liquid potpourri and some essential oils can also irritate