Four new chemicals can now replace ozone-depleting refrigerants and foam blowers

US environmental regulators have approved four new chemicals for use in refrigerators, air conditioners, and foam products. These chemicals can now replace older ones that harm the Earth's ozone layer.

For decades, companies have been trying to find replacements for chemicals that deplete the ozone layer. This rule adds new options to the list of approved substitutes. It means manufacturers have more choices for making products that comply with environmental rules.