Particulate emissions are the tiny fragments of soot that are an inevitable by-product of burning fuel in an engine, and diesel cars are an especially egregious source

Diesel cars may be emitting as much as 1,000 times the legal limit of particulate emissions, according to research by environmental think tank Transpo(...)

Traffic signs which ban diesel cars are installed by workers at the Max-Brauer Allee in downtown Hamburg, Germany May 16, 2018. Photograph: Reuters

Diesel has been under constant assault since September 2015, when Volkswagen was accused of, and eventually admitted to, massively cheating on its emi(...)