The protective action to reduce exposure by securing the building and preventing outside air ingress is best described as

The protective action to reduce exposure by securing the building and preventing outside air ingress is best described as

• A. Close all windows
• B. Open windows
• C. Run HVAC
• D. Turn on fans

Answer: (A)

To reduce exposure during a hazardous release, sheltering in place means securing the building to minimize air exchange with the outside. Closing all windows is the best way to achieve this because it blocks outdoor air from entering, helping to keep the indoor air safer and lowering the concentration of any contaminants that could seep inside. Opening windows would let contaminated air in, and running the HVAC system or turning on fans can draw in outside air or distribute contaminants throughout the building, increasing exposure. So, closing windows directly supports the protective action of reducing outside air ingress.

To reduce exposure during a hazardous release, sheltering in place means securing the building to minimize air exchange with the outside. Closing all windows is the best way to achieve this because it blocks outdoor air from entering, helping to keep the indoor air safer and lowering the concentration of any contaminants that could seep inside. Opening windows would let contaminated air in, and running the HVAC system or turning on fans can draw in outside air or distribute contaminants throughout the building, increasing exposure. So, closing windows directly supports the protective action of reducing outside air ingress.