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In page Aviation biofuel:

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NASA has determined that 50% aviation biofuel mixture can cut particulate emissions caused by air traffic by 50–70%.[11] Biofuels do not contain sulfur compounds and thus do not emit sulfur dioxide.[citation needed] While, it may be true that the burning of biofuels do not emit sulfur compounds, some forms of production, such as pyrolysis, can in fact produce sulfur compounds and other pollutants. Some potential pollutants that could be released are hydrogen sulfide and different nitrogen compounds like hydrogen cyanide, ammonia, and nitrogen dioxide.[12] There are other forms of biofuel production that may not have the same emissions.[citation needed]