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https://archive.is/6k9KC

Using historical climate data, including seasonal wind and humidity patterns, the team modeled how high lead levels over Europe must have been to explain the levels seen in the ice cores. The results suggest Rome produced between 3 and 4 kilotons of atmospheric lead every year during the Pax Romana period, McConnell explains, amounting to more than 500 kilotons total.
The researchers then applied modern epidemiological equations to estimate the cognitive impacts of those exposure levels.

Loveluck says he’s not yet convinced lead caused widespread cognitive problems. “Multiple societal factors need to be assessed before general cognitive decline can be suggested,” he says, including the impacts of local wars and food shortages.
Finch agrees, saying, “The conclusion of ‘widespread cognitive decline’ from an estimated three–IQ point decrease does not match the huge productivity of the Roman Empire when lead production was maximal.”

Sounds like a lot of gay guess work. Phys org tends to leave out details. They didn't even point out the errors with the study that science org pointed out.