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.

Ages Eligible for Study:  5 Years   -   11 Years,  Genders Eligible for Study:  Both

Criteria

• 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.