Delaware must now inspect cars for smog in its most populated county

US environmental regulators have approved Delaware's plan to start inspecting cars for emissions in New Castle County. This means cars in that county will need to pass a smog check to be registered.

For years, New Castle County has not had to inspect cars for smog, even though it is part of a region with dirty air. This change means the county must now enforce a basic emissions inspection program. It will likely reduce air pollution from vehicles in the area.