Reuters: U.S. environmental regulators said on Friday they are sending a letter to all automobile manufacturers saying they are stepping up emissions-testing activities in response to Volkswagen's alleged violations of pollution laws.
"We are upping our game," Chris Grundler, head of transportation and air quality at the Environmental Protection Agency, told reporters in a teleconference.
Volkswagen could face $18 billion in fines from the EPA after it admitted using software in diesel cars that evades...