The rule is whatever is bad for me, is what is bad for the cats. Because I am very sensitive to chemicals and other things. Ragdolls and other cats also just as sensitive. I used to avoid buying anything with formaldehyde, like particle board furniture for the cats and me. But after buying the Dyson BP04, I have started to buy it if there is no other good option, or looks too good to pass on. We will avoid buying anything with chemicals. Just to prevent a high concentration for the Dyson air purifier to clean up. The air purifier actually really works. We do our best to clean to vacuum much as possible, because the air purifier doesn't take care of bigger particles. Which is not an issue for me. Because it's more important for it remove chemicals in the air. Than something I can clean up myself.