# What Gas? > Refrigerant gas identification and information tool for environmental compliance. (iPhone/iPad app by United Nations Environment Programme.) - Source: https://appshunter.io/ios/app/what-gas/id1230722190 (this page in markdown: same URL + `.md`) - Developer: [United Nations Environment Programme](https://appshunter.io/developer/1106793919) - Category: Education, Reference - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 17+ - Requires: iOS 13.0 · 24 MB - Languages: English - Released: 2017-05-04 - Data updated: 2026-07-07 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/what-gas/id1230722190/reviews.md ## What is What Gas?? The UN Environment Programme (UNEP) OzonAction WhatGas? application is an information and identification tool for refrigerant gases: ozone depleting substances (ODS), hydrofluorocarbons (HFCs) and other alternatives. It is intended to provide a number of stakeholders, including customs officers, Montreal Protocol National Ozone Officers and refrigeration and air-conditioning technicians with a modern, easy-to-use tool that can be accessed via mobile devices to facilitate work in the field, when dealing with or inspecting ODS and alternatives. If the user requires additional information or assistance in identifying a refrigerant gas they are inspecting or that is described in the relevant paperwork, this can be easily obtained by consulting the application. The application has been updated and improved. It uses standard ODP values and GWP values as specified in the text of the Montreal Protocol; other ozone depleting potential and global warming potential values from the recent reports from the Montreal Protocol technology and scientific expert panels as well as the Intergovernmental Panel on Climate Change (IPCC) are indicated when appropriate, with references to sources of all values used. The app includes the new refrigerant mixtures (with ASHRAE approved refrigerant designations) and values for ‘actual GWP’ and ‘Kigali Amendment context GWP’ for pure substances and mixtures (i.e. only including GWP values/components assigned to controlled HFCs). The app is searchable via a variety of methods and provides a wealth of useful information. By entering partial information or browsing the database, the application will provide quick reference information on many aspects of the chemical in question, including: the chemical name and formula; type of chemical, common trade names; various chemical and commodity identifiers (CAS numbers, ASHRAE designations, HS codes, UN numbers, etc); as well as other useful information such as flammability and other hazards; the ozone depleting and global warming potentials, and if the chemical is controlled under the Montreal Protocol. The app includes both pure substances and mixtures (blends) and can also be viewed in French and Spanish. The application forms a part of UNEP OzonAction’s portfolio of activities and tools to assist developing countries. OzonAction provides assistance to various stakeholders in developing countries, including customs officers and technicians, to achieve and maintain compliance with the Montreal Protocol on Substances the Deplete the Ozone Layer. ## Key features - Refrigerant gas identification - Information on ODS and alternatives - Details on ODP and GWP values - Searchable database - Flammability and hazard information - Montreal Protocol compliance data - Available in French and Spanish ## Frequently asked questions about What Gas? ### What is What Gas? used for? What Gas? is an information and identification tool for refrigerant gases, including ozone-depleting substances (ODS), hydrofluorocarbons (HFCs), and their alternatives. It helps users identify chemicals, understand their properties, and check their regulatory status under the Montreal Protocol. ### Who developed What Gas? What Gas? was developed by the United Nations Environment Programme (UNEP) as part of their OzonAction initiative to assist developing countries in complying with the Montreal Protocol. ### What kind of information does What Gas? provide? The app provides chemical names, formulas, trade names, identifiers (CAS, ASHRAE, HS codes, UN numbers), flammability and hazards, ozone depleting potential (ODP), global warming potential (GWP), and Montreal Protocol control status for pure substances and mixtures. ### Is What Gas? available in multiple languages? Yes, What Gas? can be viewed in French and Spanish, in addition to English. This allows for broader accessibility to its users. ### What are the ODP and GWP values used in What Gas? The app uses standard ODP and GWP values specified in the Montreal Protocol text, as well as values from recent reports by Montreal Protocol expert panels and the IPCC. It also includes 'actual GWP' and 'Kigali Amendment context GWP' for controlled HFCs. ### What devices is What Gas? compatible with? What Gas? is available for iPhone, iPad, and iPod. It is designed to be a modern, easy-to-use tool accessible via mobile devices. ### How often is What Gas? updated? The latest version of What Gas? is 4.0.0, last updated on November 4, 2023. This indicates regular updates to ensure the information remains current. ### Does What Gas? have ads? No, What Gas? does not contain advertisements. It is a free application developed by the United Nations Environment Programme. ## Version history (last 4 releases) ### 4.0.0 — 2023-11-04 Refresh the whole application with new colours and rewrite using current technology. ### 2.1.0 — 2020-11-04 Fix UI issue on the ODS detail screen. ### 2.0 — 2020-05-22 -HFCs and HFC-containing mixtures -Values for ‘actual GWP’ and ‘Kigali Amendment context GWP’ for pure substances and mixtures -English, French and Spanish interfaces -Latest updated ozone depleting potential (ODP) and global warming potential (GWP) values -References to sources of all values used -New refrigerant mixtures ### 1.0 — 2017-05-02 No release notes. ## More apps by United Nations Environment Programme - [UNEP Annual Report 2015](https://appshunter.io/ios/app/unep-annual-report-2015/id1114204257) - [UNEP Publications](https://appshunter.io/ios/app/unep-publications/id1114794043) - [RAC Videos](https://appshunter.io/ios/app/rac-videos/id1191379519) - [GWP-ODP Calculator](https://appshunter.io/ios/app/gwp-odp-calculator/id1288285449) - [UN Environment Events](https://appshunter.io/ios/app/un-environment-events/id1439644718) All apps by United Nations Environment Programme: https://appshunter.io/developer/1106793919 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-07.*