I did not read the pdf but only the summary. There is a vast ravine separating correlation and causation.
The first thing that occurred to me is that people living in nice traffic free (therefore less pollutants) areas may have other reasons to be happy and not depressed compared to people living in areas of high traffic density and urban density.
zogins t1_j6ux78k wrote
Reply to Long-term exposure to even low levels of multiple ambient air pollutants, association with depression, anxiety by 9273629397759992
I did not read the pdf but only the summary. There is a vast ravine separating correlation and causation.
The first thing that occurred to me is that people living in nice traffic free (therefore less pollutants) areas may have other reasons to be happy and not depressed compared to people living in areas of high traffic density and urban density.