Health officials looked at 46,000 deaths five to six years after 9/11 attacks . According to the Centers for Disease Control and Prevention ( CDC ) , 9.3 percent of U.S. children have asthma . Adults who were expose to intense dust exposure developed cancer at higher rates . One million Americans have asthma , which causes airway swelling and inflammation .
Health officials looked at 46,000 deaths five to six years after 9/11 attacks . Adults who were expose to intense dust exposure developed cancer at higher rates . One million Americans have asthma , which causes airway swelling and inflammation .