Forskarane Hernnstadt og Muehlegger studerer samanhengen mellom lokal luftforureining og kriminalitet i Chicago. Dei brukar variasjon i vindretning på tvers av motorvegar til å identifisere den kausale effekten, og finn at valdskriminalitet er 2,2% høgre på den sida av motorvegar som har motvind (og altså får større mengde lokal forureining).
A large and growing literature documents the adverse impacts of pollution on health, productivity, educational attainment and socioeconomic outcomes. This paper provides the first quasi-experimental evidence that air pollution causally affects criminal activity. We exploit detailed location data on over two million serious crimes reported to the Chicago police department over a twelve-year period. We identify the causal effect of pollution on criminal activity by comparing crime on opposite sides of major interstates on days when the wind blows orthogonally the direction of the interstate and find that violent crime is 2.2 percent higher on the downwind side. Consistent with evidence from psychology on the relationship between pollution and aggression, the effect is unique to violent crimes – we find no effect of pollution on the commission of property crime.
