AP+Lung+Article+HW

After 9/11 there were more cases of Asthma reported than 12 times for the expected adults. This might be due to the toxic dust from when the buildings fell. When the buildings fell there was really thick dust cloud and smoke. The people at ground zero such, as the firefighters, who wore respirator mask had a "moderate protective effect" meaning the people who did wear mask didnt get asthma or only had a small case of it. The people working at ground zero that didn't have a mask or wore a paper mask were affected by the dust greatly. Since 9/11 there have been more cases of asthma due to the dust and smoke from the fall.