A method for providing at least one of a sanitizing, disinfecting, and sterilizing treatment to a product or object while inside a package by treatment with a combination of UV energy and ozone to the product while in the package. The ozone can be provided inside the package through a gas channel secured, in a gas-tight seal, to an opening of the package containing the product or object. The ozone can also be generated in the package by converting oxygen to ozone in the package while containing the product or object therein.