One up for diesel fuel

A recent study comparing emissions from current in-use diesel and compressed natural gas-fueled buses with those from a similar diesel-fueled bus equipped with advanced pollution controls would seem to challenge conventional thinking about certain clean fuel technologies.Last month, the California Air Re- sources Board (CARB), Sacramento, received results from the study, which suggested that both CNG and diesel engines would require additional emission controls in order to achieve "substantial and beneficial emission reductions" being demanded by that state, according to CARB Chairman Alan Lloyd."Although it is known that CNG total particulate matter and nitrogen oxide emissions are lower...

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