Secrecy around air pollution controls in cars faces legal challenge

New EU rules that allow car firms to keep their emissions control systems secret from the public risk another dieselgate and should be made illegal, say environmental lawyers

New EU rules that allow car manufacturers to keep pollution control systems secret from the public should be declared illegal, according to environmental lawyers.

The systems can legally cut emissions controls under certain conditions on the road, meaning more pollution is produced. But keeping these strategies secret risks another "dieselgate" scandal, according to ClientEarth lawyers, who announced on Monday that they are seeking to challenge the regulation in the European Union's court of justice.