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Bloomberg has used data on rooftop materials from a U.K.-based non-profit to create a map of Paris, the host city of the 2024 Summer Olympics. Zinc rooftops, which make up 80 percent of Parisian buildings, can heat up to 190°F in the summer, heating the surrounding areas and increasing chances of poor performance and heat stroke for athletes running the Olympic marathon. According to the visualization, the marathon route runs through the most zinc-dense areas of Paris—beginning at the Paris City Hall and ending at the historic pantheon Les Invalides—exacerbating health concerns from extreme heat for athletes.
