Which gases are considered F-gases?

• A. Nitrous oxide and methane
• B. Hydrofluorocarbons and sulphur hexafluoride
• C. Carbon dioxide and oxygen
• D. Aerosols and particulate matter

Answer: (B)

F-gases, or fluorinated gases, include substances that are primarily used in a variety of industrial applications, particularly refrigeration, air conditioning, and foam production. Hydrofluorocarbons (HFCs) and sulphur hexafluoride (SF6) are notable examples of F-gases due to their properties as potent greenhouse gases, which can have significant impacts on climate change if released into the atmosphere.

HFCs are widely utilized because of their effectiveness in replacing ozone-depleting substances and are less harmful to the ozone layer. However, they still possess high global warming potential, making their regulation important under international agreements like the Kigali Amendment to the Montreal Protocol. Sulphur hexafluoride, while less commonly used, is notable for its extremely high greenhouse gas potency and is primarily used in electrical insulation and high-voltage applications.

In contrast, the other options mention gases or substances that do not fall under the category of F-gases. Nitrous oxide and methane, while significant greenhouse gases, are not classified as F-gases. Similarly, carbon dioxide and oxygen are naturally occurring gases and not included in the fluorinated gas category. Lastly, aerosols and particulate matter refer to solid or liquid particles suspended in air, which