Question

tobacco smoke and formaldehyde are dangerous indoor pollutants. which of these is also a dangerous indoor air pollution? oxygen gas radon gas

Explanation:

• Oxygen gas (\(O_2\)) is essential for respiration and is not a dangerous indoor pollutant.
• Radon gas (\(Rn\)) is a radioactive, odorless, and colorless gas. It can seep into buildings from the ground and accumulate indoors. Prolonged exposure to radon gas is a significant health hazard as it is a known carcinogen, increasing the risk of lung cancer.

Answer:

Radon gas