In October 2001 at the site of the World Trade Center in New York City, fires were still burning from the terrorist attacks that had brought down the buildings. The greatest danger to the respiratory system was
A)the odor.
B)very small particles of debris.
C)very large particles of debris.
D)falling material from damaged buildings.

Question

Quizplus · Accepted Answer

The small particles of debris, such as dust, ash, and soot, posed the greatest danger to the respiratory system as they could easily be inhaled and cause damage to the lungs. The odor, falling material, and large debris also posed risks, but to a lesser extent.

In October 2001 at the Site of the World Trade