Lack of options
Recent studies show that neither using clean diesel fuel nor improving the quality of the engine help in solving the threat of particulate matter in diesel emissions. So banning the manufacture of diesel cars may be the only option to counter the threats posed by particulate matter.
Fuel quality A recent study conducted in California comparing emissions from a new diesel engine running on older diesel fuel, and on a reformulated diesel fuel, revealed that the newer fuel only slightly reduced emissions of nox and particulates.
A report in the leading monthly review of worldwide developments in automobile technology, Automotive Environment Analyst, published in February 1999, goes on to state, "Contrary to most current thinking, switching to ultra-low sulphur fuel, so-called