Asthma is the most prevalent chronic disease in childhood and accounts for the highest rate of hospitalizations in the ages between 0-4 years. Unfortunately, there are few noninvasive objective measurements of pulmonary health in children. Current techniques include determination of peak flow, spirometry, and measurement of nitric oxide (NO). Bronchial inflammation is a central feature of asthma and anti-inflammatory therapy is the mainstay of treatment. Expired NO (eNO) has been shown to correlate with bronchial inflammation. However, the collection of NO has only been available in research settings due to the limitations of collection and analysis. In contrast, exhaled breath condensate (EBC) is easily obtained and pH analysis technically simple.