Air pollution (IMAGE) George Washington University Caption Nearly 2 million new cases of pediatric asthma every year may be caused by a traffic-related air pollutant, according to a new study published today Credit Chris Leboutillier Usage Restrictions No restrictions. License CC0 Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.