The WhatGas? UNEP OzonAction application is an information and identification tool for refrigerant gases for ozone-depleting substances(ODS), HFCs, and other alternatives. It is intended to provide a number of stakeholders, including Montreal Protocol National Ozone Officers, Customs Officers, and refrigeration and air-conditioning technicians with a modern, easy-to-use tool that can be accessed via mobile devices or the OzonAction website to facilitate work in the field, when dealing with or inspecting ODS and alternatives, and as a useful reference tool.