How does carbon monoxide affect indoor air quality?

Carbon monoxide significantly impacts indoor air quality as it is a colorless and odorless gas that can be very dangerous, especially in areas with inadequate ventilation. This gas is produced by combustion processes, such as those from gas stoves, heaters, and motor vehicles. When carbon monoxide accumulates in poorly ventilated spaces, it can lead to serious health issues, including headaches, dizziness, confusion, and in severe cases, it can be fatal.

The nature of carbon monoxide's effects on health is what makes it a critical concern for indoor air quality. Since people may not be aware of its presence due to its lack of color and odor, it can build up to dangerous levels without detection. Proper ventilation and carbon monoxide detectors are essential in homes to minimize these risks.

In contrast, the other options present incorrect or misleading information regarding carbon monoxide. It is not a safe gas emitted by household plants, nor does it contribute positively to indoor environments. Additionally, carbon monoxide does not facilitate better air circulation; instead, it poses significant health hazards when present in high concentrations indoors.