Which of the following can be considered a potential indoor air pollutant?

Indoor air pollutants are various substances found in indoor environments that can adversely affect health and comfort. Among the choices provided, both asbestos and formaldehyde as well as carbon monoxide are recognized as significant indoor air pollutants.

Asbestos is a naturally occurring mineral that can be found in some older buildings, especially in insulation and flooring. It poses serious health risks when disturbed, as inhalation of asbestos fibers can lead to respiratory diseases, including lung cancer and asbestosis.

Formaldehyde is a volatile organic compound (VOC) commonly used in building materials and household products, such as adhesives, pressed wood products, and some cleaning agents. It can irritate the eyes, skin, and respiratory system, and prolonged exposure is linked to more serious health effects.

Carbon monoxide is a colorless, odorless gas produced by burning fossil fuels. It can accumulate indoors, especially when heating systems are malfunctioning or poorly ventilated, leading to potentially fatal health outcomes due to its ability to prevent oxygen from entering cells.

Since all three substances can negatively impact indoor air quality and pose various health risks, the option indicating that all of the mentioned choices are potential indoor air pollutants is indeed correct. This highlights the importance of recognizing and managing these pollutants to ensure safer indoor environments.