Research has shown that social determinants of health such as environmental quality influence a person’s health outcomes. A longitudinal, cohort study of 8.9 million Medicare recipients sought to understand the association between long-term exposure to common air pollutants and a diagnosis of depression in older adults (aged 64 and older). When accounting for other environmental factors, exposure to fine particulate matter, nitrogen dioxide, and ozone was associated with an increased risk of depression – with the risk increasing the longer the exposure. To learn more, see the study in JAMA Network Open.