An analysis of 25 studies suggests there is a link between air pollution and depression and suicide, but it isn’t clear yet whether pollution is a direct cause of these
Source:
https://www.newscientist.com/article/2228139-air-pollution-linked-to-increased-risk-of-depression-and-suicide/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home