Only piston-engined aircraft use leaded gas. That rules out almost 100% of commercial passenger and military aviation. Unlikely that there's enough of this typ

Only piston-engined aircraft use leaded gas. That rules out almost 100% of commercial passenger and military aviation. Unlikely that there's enough of this type of exposure to be a real factor. Even this study finds that it affects children living within 500m of a civilian airport and that the level of lead detected was "not especially large." There may be an argument for phasing out leaded avgas, as no amount of lead exposure is good, but it's not likely to have an impact on overall violence in an area, even assuming that lead has anything to do with that in the first place.