November 17, 2014 | The New York Times
Exposure to secondhand smoke and roadway traffic may be tied to increased body mass index in children and adolescents, a new study suggests. Researchers studied 3,318 children in 12 Southern California communities beginning at an average age of 10, and then followed them through age 18. They used parental questionnaires to establish exposure to smoking, and data on traffic volume and levels of nitrogen dioxide, ozone and particulates to track pollution. [...]