The Seventies :
Smog alert in the Ruhr area, acid rain, dying spruce trees in the Bavarian Forest.
In those days, the solution was filter systems for the smokestacks in the Ruhr area.
www.ist.fraunhofer.deDie Siebzigerjahre :
Smogalarm im Ruhrgebiet, saurer Regen, sterbende Fichten im Bayerischen Wald.
Damals waren Filteranlagen für die Schlote im Ruhrgebiet die Lösung.
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