Is asphyxiation caused by breathing toxic substances in the air?

Asphyxiation can indeed be caused by breathing toxic substances in the air, so the correct response highlights this possibility. Toxic substances can displace oxygen or interfere with the body's ability to use oxygen, leading to asphyxiation regardless of the environment. This can occur in various settings—such as industrial workplaces, poorly ventilated areas, or near sources of hazardous fumes—where the air is contaminated with harmful chemicals or gases.

In contrast, the other options are limited in scope. The reference to asphyxiation being usually caused by a lack of oxygen overlooks the complexities of air quality and the role that pollutants can play. Similarly, stating that asphyxiation occurs only in enclosed spaces ignores the fact that toxic exposure can happen in open areas as well. Furthermore, suggesting that such effects only happen after prolonged exposure fails to consider that significant harm can occur rapidly, depending on the concentration of the toxic substances. Understanding these dynamics is crucial for recognizing the diverse risk factors associated with asphyxiation in various environments.