Shell is working with UK researchers to study the potentially hazardous nano-particles that are spewed out in diesel and bio-fuel engine emissions. Although diesel engines obtain about 30 per cent better mileage and emit far less carbon dioxide than petrol engines, they can pump out up to 400 times more particulate matter. The exhaust fumes can contain a wide variety of hazardous ultra-fine and nano-particulates. These are believed to lead to a number of serious health problems, including asthma, irregular heartbeats and even premature death from heart and lung disease.
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