Which of the following gases are considered F-gases?

F-gases, or fluorinated gases, play a significant role in global warming and are regulated under various environmental policies. The gases classified as F-gases include hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6), all of which are used in various applications such as refrigeration, air conditioning, and insulation.

HFCs are particularly notable because, while they were introduced as replacements for ozone-depleting substances, they still have high global warming potential. PFCs are used in industrial applications, and SF6 is used primarily in the electrical industry as an insulator due to its excellent dielectric properties and thermal stability. The regulation of these gases aims to mitigate their impact on climate change while seeking alternatives that are less harmful to the environment.

In terms of the other options, hydrochlorofluorocarbons (HCFCs) are being phased out as they still contribute to ozone depletion, although they are not categorized under F-gases in the same context as HFCs, PFCs, and SF6. Nitrogen oxides (NOx) and greenhouse gases like methane (CH4) and carbon dioxide (CO2) fall