What should you remove from a passenger's face when using portable oxygen?

When using portable oxygen, it's essential to remove any grease or makeup from a passenger's face. This is because substances such as grease can pose a risk in conjunction with oxygen, as oxygen supports combustion. Makeup products may contain flammable chemicals that could ignite in the presence of high concentrations of oxygen, posing a safety hazard during an emergency when oxygen is required for the passenger's respiratory assistance.

Ensuring that the face is clean and free from such substances maximizes safety while providing necessary oxygen. Other items like jewelry, accessories, facial hair, and glasses, while they may have their importance in specific circumstances, do not carry the same risk associated with combustible materials in the context of using oxygen therapies. Therefore, prioritizing the removal of grease or makeup is a crucial safety measure during oxygen administration.