London Underground polluted with metallic particles small enough to enter human bloodstrem
15 December 2022̽»¨Ö±²¥London Underground is polluted with ultrafine metallic particles small enough to end up in the human bloodstream, according to ̽»¨Ö±²¥ of Cambridge researchers. These particles are so small that they are likely being underestimated in surveys of pollution in the world’s oldest metro system.