This places another nail in the diesel engine coffin. Since the VW diesel scandal, demand for diesel powered vehicles in Europe has plummeted.
German cities can ban the most heavily polluting diesel cars from their streets, a court ruled on Tuesday, a move likely to accelerate a shift away from the combustion engine and force manufacturers to pay to improve exhaust systems.
The court said Stuttgart, which styles itself the birthplace of the modern automobile and is home to Mercedes-maker Daimler, should consider gradually imposing a year-round ban for older diesel models, while Duesseldorf should also think about curbs.
Stuttgart is also the home of Porsche.