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This is why specifically lead is highlighted.

Just more of the extremely high cost of being poor.

I’m guessing OP was aware of this but was more questioning whether we know this was because of lead exposure or just the fact the school system isn’t good. It seems it would be hard to separate the two. Like was said: there are plenty of cities with similar results but without the lead exposure. The lead could definitely be a contributing factor, it’s just hard to know.

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