Exclusion: Mild intermittent asthma, defined as either seasonal asthma or (daytime asthma symptoms <2x/week and nocturnal symptoms <2x/month and no use of controller medications); under the ongoing care of an allergist or pulmonologist; regular use of oral corticosteroids; currently receiving case-management for their asthma; unable to speak, read or understand English; planning to leave the catchment area within the next two years