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London Underground is polluted with METALLIC particles small enough to end up in the bloodstream | Daily Mail Online
The London Underground is polluted with ultrafine metallic particles, small enough to enter the human bloodstream, according to a Cambridge University study.
↗ https://www.dailymail.com/sciencetech/article-11541543/London-Underground-polluted-METALLIC-particles-small-end-bloodstream.html