From Reuters:

Children living in high-stress households are more vulnerable to lung damage from traffic pollution than children whose parents are less stressed out, according to the results of a new study.

“It makes sense,” said Dr. Jane Clougherty from the University of Pittsburgh, who was not involved in this study. “The bodily wear and tear induced by…stress could make the individual more susceptible to the effects of traffic-related air pollution.”

The researchers took measurements of several indicators of lung function in nearly 1,400 children living in southern California.

They also predicted the amount of traffic pollutants the children were exposed to by sampling almost 1,000 different sites around the area. In particular the researchers were looking for nitrogen oxides, which are formed when fuel is burned. Nitrogen oxides can damage lung tissue and make asthma worse, they explain in an article in the American Journal of Respiratory and Critical Care Medicine.

Six years earlier, the children’s parents had filled out a questionnaire about their level of stress. The questions asked how often they felt able to handle personal problems or felt in control, for instance.

Air pollution levels varied widely depending on where the children lived, from six parts per billion of nitrogen oxides to 101 parts per billion.

For kids from high-stress homes, when the average amount of nitrogen oxides in the air went up by 22 parts per billion, their lung function got roughly five percent worse.

That same increase in pollutants around a child whose parents had a low level of stress made no difference to their lung function, however.

Dr. Talat Islam from the University of Southern California, the lead author of the study, said he expected that stress would lead to a bigger effect of pollution on kids, but he was surprised that increased air pollution had no effect on the kids from low-stress homes.

“We see the whole effect of traffic-related air pollution in those children who were exposed to higher stress,” Islam told Reuters Health.

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