Which of the following is considered a prominent indoor air pollutant?

Concept

Indoor air pollutants are contaminants that accumulate inside buildings and can affect health even when they are not easily noticed.

A pollutant is especially important indoors when it has a common entry source, can build up in enclosed spaces, and has a well-established health effect.

Application

Radon is a naturally occurring radioactive gas released from soil and rock. It can seep through cracks and openings in foundations, accumulate indoors, and long-term exposure increases the risk of lung cancer.

Contrast

• Mercury is a toxic metallic element; indoor exposure is usually linked to vapour released from broken mercury-containing products or spills.

• Helium is an inert noble gas used in balloons and cryogenic systems; a large release in an enclosed space mainly lowers the available oxygen.

• Argon is an inert noble gas used in welding and lighting; a large release in an enclosed space mainly lowers the available oxygen.

Result

Therefore, radon is the prominent indoor air pollutant among the listed substances.