The study found that teens in place with higher levels of nitrogen oxides, which come from diesel vehicles, were most at risk.The study found that teens in place with higher levels of nitrogen oxides, which come from diesel vehicles, were most at risk. Teens living in dirty air 70% more likely to have symptoms such as paranoia, study finds. Young people living with higher levels of air pollution are significantly more likely to have psychotic experiences, according to the first study of the issue.