2-17 years old For subjects 3 years and older, a known history of asthma as diagnosed by the PCP or per the ACH problem list For children ages 2-3 years, four or more episodes of wheezing in the past year that lasted more than 1 day and affected sleep AND one of the following: parental history of asthma, a physician diagnosis of atopic dermatitis, or evidence of sensitization to aeroallergens Acute asthma exacerbation Pediatric Asthma Score (PAS) ≥ 8 Parents willing and able to sign consent Children over the age of 6 willing to provide assent