FRANKFURT -- Adam Opel will offer a particle filter on every diesel-powered car it sells in Germany as of July 1, the General Motors unit said on Thursday.
The move comes amid a debate in Germany about the harmful effects of diesel soot on people's health. Particle filters trap the soot.
Although industry officials have played down the debate's impact on sales of diesel cars that account for around half of the overall market, analysts have said cars without filters could have lower resale values.
The German federal cabinet last month approved tax breaks for particle filters on new cars and for motorists who retrofit them on used cars, but the legislation is stalled in parliament.
Diesel-powered cars are popular in Germany and many other European countries due to their efficiency, durability and relatively lower fuel prices.
DaimlerChrysler's Mercedes-Benz brand also offers a broad range of filters, as does French carmaker PSA Peugeot Citroen.