EU asks members to investigate after VW admits new irregularities

By Barbara Lewis BRUSSELS (Reuters) - The European Commission has written to all 28 European Union member countries urging them to widen their investigations into potential breaches of vehicle emissions rules after Volkswagen admitted it had understated carbon dioxide levels. Europe's biggest motor manufacturer admitted in September it had rigged U.S. diesel emissions tests to mask the level of emissions of health-harming nitrogen oxides. In a letter seen by Reuters, the Commission said it was n