Why should management of construction pollution be a first priority?

• A. Because the flush must be conducted before occupancy
• B. Because it takes time to conduct a flush
• C. Because it is required by law
• D. Because construction pollution is not harmful

Answer: (B)

The main idea here is that reducing construction-related pollutants requires time to dilute and remove them from the indoor environment. During construction, dust, VOCs, solvents, and off-gassing from materials can accumulate in the space. A flush-out—ventilating with outdoor air at a higher rate to lower pollutant concentrations—takes time and scheduling to reach acceptable levels. Because this process cannot be completed instantly, it must be planned as a priority so there is enough lead time to achieve good indoor air quality before people occupy the space. If you wait, pollutants may remain at levels that affect health and comfort, delaying occupancy and needing additional remediation. The other options don’t capture this practical time requirement or the condition of occupant safety; legal requirements vary by location, and it’s not accurate to say construction pollution isn’t harmful.