Rezultatele studiului, potrivit incomemagazine, au arătat ca particulele din aerul din metrou au cel mai distrugător efect aupra ADN-ului uman, comparativ cu particulele prezente în emisiile auto şi cu particulele formate ca urmare a arderii lemnului. S-a constatat, astfel, că aerul din metrou cuprinde un număr mai mare de particule de fier, care apar prin frecarea roţilor de şine. Când respectivele particule ajung în organismul uman, în celule se formează radicali liberi, care exercită o acţiune ucigătoare asupra ADN-ului, sporind, astfel, riscul de afecţiuni canceroase. ”Este o problemă foarte serioasă, pentru că nivelul de concentraţie a acestor particule în aer este destul de ridicat, iar oamenii îl inhalează pe o durată îndelungată de timp”, a comentat doctorul Karlsson. În opinia expertului, rezultatele obţinute demonstrează necesitatea asigurării unui sistem mai performant de purificare a aerului din metrou. Particule se formează, de asemenea, prin frecarea pneurilor maşinilor de suprafaţă drumurilor, ele putând determina, conform studiului, puternice reacţii inflamatorii în organism. Particulele dăunătoare pot fi o consecinţă a arderii incomplete a carburantului sau uzării asfaltului.
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