Which of the following is an example of an indoor air contaminant?

Dust mites are indeed an example of an indoor air contaminant. These microscopic organisms thrive in indoor environments, particularly in areas where there is a presence of organic material like skin flakes, which serve as their food source. They are commonly found in bedding, carpets, and upholstered furniture, contributing to indoor air quality issues.

The presence of dust mites can lead to various health problems, particularly for individuals with allergies or asthma, as they can trigger allergic reactions. Hence, understanding dust mites as indoor air contaminants is critical in occupational hygiene, where the goal is to ensure a safe and healthy work environment.

While other options represent substances that can affect air quality, they do not fall under the same category as dust mites, which are living organisms that specifically thrive indoors and contribute to health issues related to indoor air pollution.