This is meant to limit emissions of particulate matter and nitrogen oxide (NOx), known to cause respiratory disease, after Volkswagen in 2015 admitted to cheating US exhaust tests.
The landmark case could have a huge impact for Germany's auto industry if the court rejects an appeal against implementing bans on diesel cars.
Oliver Schmidt, the second and most senior employee of the German automaker to plead guilty in the emissions cheating scandal, is among seven VW executives US prosecutors have charged.
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