Some scientist took to mapping IQ levels geographically and everyone who lives downwind of a small airport has a consistent and directly proportional drop to the average concentration of airborne lead for about 1-4 miles surrounding them. The drops in IQ even perfectly match the wind patterns. It’s insane. If you live really close to a small airport, pack up and move away.
It’s also crazy that they allowed small aircraft to get away with not having to follow the same fuel regulations, it’s really a small difference in cost, our politicians are just too bought out.
Edit: but also, the rest of us likely breathe it in as well, just not as much, and we haven’t figured out exactly how much; ostensibly because it spreads out too much and thus affects everyone more evenly. Yay “energy” corporations and capitalism.