It took a blaze that nearly destroyed Paris’ most famous cathedral to reveal a gap in global safety regulations for lead, a toxic building material found across many historic cities. After the Notre Dame fire in April spewed dozens of tons of toxic lead-dust into the atmosphere in just a few hours, Paris authorities discovered a problem with the city’s public safety regulations: There was no threshold for them to gauge how dangerous the potentially-deadly pollution was from the dust that settled on the ground. Officials in other historic European capitals such as Rome and London, as well as the U.S. Environmental Protection Agency and the World Health Organization also have no such outdoor lead dust hazard guidelines.
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