The results generated by a leading independent diesel engine emissions lab in California, Olson EcoLogic Engine Testing Laboratories include the mitigation of the 5% increase in oxides of nitrogen (NOx) created by a B-20 biodiesel baseline; an improvement of the particulate matter (PM) reduction associated with the same B20 biodiesel to nearly 30%; and the reduction the total hydrocarbon (THC) emissions by 5%.
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(The success of the biodiesel fuel industry relies heavily on biodiesel testing <http://www.youtube.com/watch?v=s32Ke2VzrqU>, not only at the production level but at the consumer level, where degraded fuel may cause engine failures.  Of major concern to diesel and biodiesel users is the very real possibility that water has contaminated their fuel. (See http://www.youtube.com/watch?v=0YcczdvPyAk).  The potential catastrophic impact of this problem is discussed at length  in this video at: http://www.youtube.com/watch?v=-lh4qhXc_5s&feature=youtube_gdata.
Fleet Fuel's  family of inexpensive biodiesel test kits  is just a click away on the internet at:
<http://fleetbiodiesel.com/biodiesel_testing_and_supplies.html>)