The unique problem of cleaning diesel engine exhaust

According to the charges leveled last week, Volkswagen used a software “defeat device” to cheat on the testing. Allegedly, the software, when it detected regulatory testing, ran a different, more controlled engine calibration to meet test requirements. Actual nitrogen oxide emissions were as much as 40 times the U.S. standard.

[ EPA announces more-rigorous testing of all diesel cars in wake of VW scandal ]

Source: | THE WASHINGTON POST September 25, 2015
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