On: Finding that lead emissions from aircraft engines ...

[dadjoker]

Shorter EPA: "Look, here's one more way we can cripple our economy! Yea!"

[skeaker → dadjoker]

If that's the only angle you care about, then consider that a population free of lead-induced brain damage provides a stronger economy in the long run as more of them are able to enter the workforce rather than prison [1] or a grave [2].

[1] https://en.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesis [2] https://en.wikipedia.org/wiki/Lead_poisoning