Air Systems Cleaning Specialist (ASCS) Practice Exam

Which of the following contaminants is most likely to be found in air ducts?

1. Pollen

2. Mold spores

3. Cigarette smoke

4. All of the above

The correct answer is: All of the above

All of the mentioned contaminants can indeed be found in air ducts, which is why this option is the most comprehensive choice. Pollen is a common allergen present in the air, especially during certain seasons, and it can be drawn into the HVAC system through the return air ducts. Once in the ducts, pollen can accumulate and contribute to poor indoor air quality, especially for individuals with allergies. Mold spores thrive in damp environments, and air ducts can provide a suitable environment for their growth if moisture is present. Mold can spread through the HVAC system when air circulates, leading to health issues and further contamination. Cigarette smoke contains a variety of harmful substances and particulate matter that can settle in air ducts over time. This residue can create a persistent odor and contribute to respiratory problems for occupants. By recognizing that all these contaminants are potential hazards in air ducts, it is clear that the selection which includes them all is accurate and reflects the reality of indoor air quality management.