California and the U.S. Environmental Protection Agency on Wednesday finalized a $1.67 billion settlement with truck engine maker Cummins — the largest civil penalty ever assessed under the federal Clean Air Act — after the company installed devices on more than 600,000 RAM pickup trucks that regulators said illegally bypassed emission tests, resulting in ten of thousands of tons of excess pollution. The penalty is the second largest the EPA has ever recovered under any environmental law, behind the $20 billion settlement in the 2010 BP Deepwater Horizon platform explosion and oil spill, which...