What type of ventilation system is comparable to "sweeping dirt under the rug"?

The comparison of a ventilation system to "sweeping dirt under the rug" suggests a method that merely disperses pollutants rather than effectively removing them from the environment. Dilution ventilation works by mixing contaminated air with fresh air to lower the concentration of pollutants. While it does reduce the immediate concentration of harmful substances in a given area, it does not eliminate them. Instead, this system essentially spreads the pollutants out, which can lead to long-term exposure risks.

In contrast, local exhaust ventilation focuses on capturing and removing contaminants at their source, makeup air systems replenish indoor air with fresh air, and natural ventilation relies on passive airflow without mechanical assistance. Thus, these other options represent more effective strategies in managing indoor air quality, rather than simply diluting and distributing pollutants.