emissions

Volvo, the world’s second-largest truckmaker, has uncovered a faulty component in the emissions-control setup of vehicles widely sold in Europe and the U.S., the manufacturer’s biggest markets.

To test how Americans feel about its plan for rolling back car and truck pollution standards, the Trump administration will hold an initial public hearing Sept. 24 in Fresno, Calif., a place where it might reasonably expect a friendly response.

DENVER — The Trump administration is rolling back some U.S. regulations on climate-changing methane pollution, calling them expensive and burdensome, but Colorado says its rules are working — and they have industry support.

The Trump administration will seek to revoke California’s authority to regulate automobile greenhouse gas emissions — including its mandate for electric car sales — in a proposed revision of Obama-era standards, according to three people familiar with the plan.