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https://kaiserplatzaachen.wordpress.com/2016/11/06/aachen-kleinste-mengen-feinstaubs-koennen-lungenkrebs-verursachen-was-tut-aachen-in-sachen-busflotte/
Aachen: kleinste Mengen Feinstaubs k├Ânnen Lungenkrebs verursachen. Was tut Aachen in Sachen Busflotte?