Participants that qualify for the study will have one of the following health conditions: persistent asthma as defined by NHLBI guidelines, chronic respiratory symptoms, and/or have lead levels equal to or above 15 micrograms per deciliter. They must be between the ages of 2 and 17 years of age, and stay in the home a minimum of 4 nights per week and, they should reside in the KCEEC (Defined as the city limits of Kansas City Kansas or Kansas City Missouri). They will also have lived in the same housing, either rental or self-owned, for at least 6 months and have a reasonable expectation of remaining in this housing for at least one additional year.