U.S. Environmental Protection Agency chief Scott Pruitt said the agency must ensure Volkswagen AG's excess diesel emissions is not repeated, and will treat improper behavior by automakers "very aggressively." Since Volkswagen admitted in September 2015 to illegally using software to evade emissions regulations, the EPA has been investigating diesel issues in a number of other automakers including Fiat Chrysler Automobiles and Daimler AG.
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