Diesel is dirty business. In spite of the best efforts of automakers to clean the fuel up with urea and other additives in recent years, the oily fuel emits far more nitrogen oxide emissions than gasoline—the karmic price to pay for its superior fuel economy. And while we've know that diesel wasn't great for the environment (or the people in it) for some time, we're still learning just how bad they really are. A new study has found that diesel vehicles from 10 major regions around the globe actually produced 50 percent more nitrogen oxide than scientists previously thought.
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