https://www.canada.ca/en/health-canada/services/publications/product-safety/changes-registration-piperonyl-butoxide-pesticides-non-agricultural-uses.html
Registration of piperonyl butoxide pesticides changes (non-agricultural uses) - Canada.ca
Re-evaluation decision concerning the non-agricultural uses of the active ingredient piperonyl butoxide, published on March 2, 2023
piperonyl butoxideregistrationpesticides