Asthma Severity in Children and Environmental Agents

This study measures residential exposures (indoor allergens, mold, nitrogen dioxide, nicotine) and relates exposure levels to daily symptoms (wheeze, persistent cough, chest tightness, shortness of breath) and medication use, in a population of children with physician diagnosed asthma, followed for 12 months.

• Siblings of a birth cohort recruited 1997-1999
• Age less than 11 years
• Physician diagnosed asthma
• Active symptoms (wheeze, persistent cough, chest tightness, shortness of breath) or medication use in the 12 months prior to enrollment.