Summary: An increase in depressive symptoms in adolescence has been linked to ozone exposure as a result of air pollution, even in areas that meet air quality standards.
Exposure to ozone from air pollution has been linked to an increase in depressive symptoms for adolescents over time, even in neighborhoods that meet air quality standards, according to new research published by the American Psychological Association.
Ozone is a gas that is produced when various pollutants from motor vehicle exhaust, power plants and other sources react to sunlight. Higher ozone levels have been linked to various physical ailments, including asthma, respiratory viruses and premature death from respiratory causes.
This study is the first to link ozone levels to the development of depression symptoms in adolescents over time. Those symptoms may include persistent feelings of sadness or hopelessness, difficulty with concentration, sleep disturbances and thoughts about suicide.
“I think our findings really speak to the importance of considering air pollution’s impact on mental health in addition to physical health,” said lead researcher Erika Manczak, PhD, an assistant professor of psychology at the University of Denver.
The researchers analyzed data from a previous study about early life stress with 213 adolescent participants (aged 9 to 13 years old) in the San Francisco Bay area. The researchers compared data about the adolescents’ mental health over a four-year period with Census tracts for their home addresses and air quality data for those tracts from the California Environmental Protection Agency.
Adolescents who lived in areas with relatively higher ozone levels showed significant increases in depressive symptoms over time, even though the ozone levels in their neighborhoods didn’t exceed state or national air quality standards. The findings weren’t affected by the participants’ sex, age, race, household income, parental education or socioeconomic characteristics of their neighborhoods. The research was published online in Developmental Psychology.
“It was surprising that the average level of ozone was fairly low even in the communities with relatively higher ozone exposure,” Manczak said. “This really underscores the fact that even low levels of ozone exposure have potentially harmful effects.”
Ozone and other components of air pollution can contribute to high levels of inflammation in the body, which has been linked to the onset and development of depression. Adolescents may be especially sensitive to these effects because they spend more time outdoors.
The study included a relatively small sample size from one area of the United States. The findings are correlational so it can’t be proven that ozone levels caused an increase in depressive symptoms, only that there is a link between them. It’s also possible that other components of air pollution besides ozone could be a factor.
Because air pollution disproportionately affects marginalized communities, ozone levels could be contributing to health disparities, Manczak said. Communities also should consider ways to reduce ozone exposure, such as holding youth sporting events indoors when necessary and limiting driving during peak hours of air pollution alerts. Investment in clean and renewable energy sources that reduce air pollution also could be helpful.
“I believe state and federal air quality standards should be stricter, and we should have tighter regulations on industries that contribute to pollution,” Manczak said. “Our findings and other studies suggest that even low levels of ozone exposure can pose potentially serious risks to both physical and mental health.”
About this depression and pollution research news
Author: Todd Bentsen Source: APA Contact: Todd Bentsen – APA Image: The image is in the public domain
Census Tract Ambient Ozone Predicts Trajectories of Depressive Symptoms in Adolescents
Exposure to ozone is a well-documented risk factor for negative physical health outcomes but has been considered less frequently in the context of socioemotional health.
We examined whether levels of neighborhood ozone predicted trajectories of depressive symptoms over a four-year period in 213 adolescents (ages 9–13 years at baseline; 57% female; 53% of minority race/ethnicity).
Participants self-reported depressive and other types of psychopathology symptoms up to 3 times, and their home addresses were used to compute ozone levels in their census tract.
Possible confounding variables, including personal, family, and neighborhood characteristics, were also assessed.
We found that higher ozone predicted steeper increases in depressive symptoms across adolescent development, a pattern that was not observed for other forms of psychopathology symptoms.
These findings underscore the importance of considering ozone exposure in understanding trajectories of depressive symptoms across adolescence.