Has anyone researched the comparative exhaust emissions of of SVO, WVO, and biodiesel?

I seem to remember that burning straight vegetable oil, either new or waste, results in some pretty bad stuff coming out the exhaust. That may be why ADM and others have little interest in selling SVO as fuel. Too expensive to clean up the exhaust. But biodiesel apparently is pretty clean.

I make and use biodiesel during the summer months. Five hundred gallon batches. My family of four drives six diesels and a trio of gassers. How could four people possibly need nine cars?

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Dale
'67 Volvo 122
'79 Rabbit Diesel
'79 M-B 300TD
'82 M-B 300D
'83 M-B 300CD
'85 M-B 300TD
'86 Isuzu P'up TD
and a couple of Hondas