[Comment: There are many risk factors for asthma and many environmental contributors. Traffic and indoor air pollutino from cleaning products, air fresheners, and furnishings are two contributors.]
Traffic air pollution near school associated with onset of asthma.
http://www.environmentalhealthnews.org/ehs/newscience/traffic-air-pollution-at-schools-associated-with-asthma-onset/
http://www.environmentalhealthnews.org/ehs/newscience/traffic-air-pollution-at-schools-associated-with-asthma-onset/
"The risk for developing asthma increases in children who are exposed to traffic-related air pollution at school. Children who breathe traffic-related air pollution at school are more likely to develop asthma, even after taking into account levels of air pollution at their homes, report researchers in the journal Environmental Health Perspectives."
