Background Traffic-related air pollution has been associated with adverse cardiorespiratory
effects, including increased asthma prevalence. However, there has been little study of
effects of traffic exposure at school on new-onset asthma. Objectives We evaluated the
relationship of new-onset asthma with traffic-related pollution near homes and schools.
Methods Parent-reported physician diagnosis of new-onset asthma (n= 120) was identified
during 3 years of follow-up of a cohort of 2,497 kindergarten and first-grade children who …