Asthma is a leading chronic illness among children and adolescents in the United States. It is also one of the leading causes of school absenteeism. On average, in a classroom of 30 children, about 3 are likely to have asthma.
When children and adolescents are exposed to things in the environment—such as dust mites, and tobacco smoke—an asthma attack can occur. These are called asthma triggers.
For additional information visit http://www.cdc.gov/asthma/ or view this Asthma Brochure