Exposure to air pollution is linked to an increase in violent crime
For all those commenting on 'aren't more polluted areas just more criminal due to other factors", as far as I can tell the researchers examined crime rates for the same place and find correlation with whether there was more Ozone and PM 2,5 on a particular day or not.So they are not comparing clean air neighborhoods to  highly polluted neighborhoods, but the same neighborhood on different days.https://www.sciencedaily.com/releases/2019/10/191003114007.h...