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Study finds PM from biodiesel blends may be 50-80% less toxic per unit PM mass than from petroleum diesel

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However, the relative toxicity of biodiesel emissions compared to petroleum diesel remains unclear. Error bars are one standard deviation from the mean, letters indicate statistical similarity. nmol/min/mg PM for B0 and B100, respectively, and from 22.6 ± 4.5 PM-normalized DTT Activity for biodiesel exhaust PM. Click to enlarge.

B0 186
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Massachusetts to Accept Only Waste-Derived Biofuels to Qualify for Mandate for Diesel and Home Heating Oil

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Waste feedstock shall include, but not be limited to: waste vegetable oils, waste animal fats, substances derived from wastewater and the treatment of wastewater or grease trap waste. The state Department of Energy Resources has authority to delay the minimum content requirements if there are no biofuels available that meet those standards.