If I understand my atmospheric chemist friends correctly, the big pollutant problem from diesel is the particulates, not hydrocarbons or sulphur, and that the trains, trucks, stationary generators, outweigh the diesel car as a source of these pollutants. Apparently many health effects, including cardiac and stroke, are related to particulates, but this has been a tough measure for environmental groups to push as a "new" pollutant in Washington, so the push is on decreasing the limits on already regulated hydrocarbons and sulphur as a means of "discouraging" particulate generation.

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JCE
87 300E, 65k miles
Smoke Silver

[This message has been edited by JCE (edited 10-04-2000).]