TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The polar fluid may also oxygen.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The alcohol is aqueous alcohol having 1-4C, particularly methanol or ethanol. The emulsifier comprises a single species comprising noncyclic polyol fatty acid esters or noncyclic polyol fatty alcohol ethers. Water or alcohol is a polar fluid. Preferred Function: The biodiesel composition reduces emissions of nitrogen oxides and particulates by a threshold amount upon combustion of the biodiesel composition, relative to biodiesel fuel alone. The components of the biodiesel composition form micelles in which a substantially monomolecular layer of emulsifier component surrounds a substantially alcohol/water core. Preferred Compound: The unsaturated fatty acids comprise arachidic, elaidic acid, erucic acid, gadoleic acid, margaroleic acid, myristoleic acid, linoleic acid, linolenic acid, palmitoleic acid, or oleic acid (preferably oleic acid). The emulsifier is glyceryl monooleate. The alcohol comprises envirolene, n-butanol, or isopropanol Preferred Condition: At least about half of the monoglycerides are end substituted. The biodiesel composition is fluid at room temperature or suspended in air to form an aerosol. It has a viscosity of less than 10 millipascals. Preferred Composition: The emulsion contains less than or equal to 90% biodiesel fuel. The biodiesel composition further comprises a small amount of additive(s) comprising thermal stabilizers or combustion modifiers.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The polyol fatty acid esters and polyol fatty alcohol ethers include monoglycerides of unsaturated fatty acids. EXAMPLE - A biodiesel composition was made comprising (wt.%): diesel (71.4), ethanol (12.0), water (2.0), ammonia (0.5), 2-ethyl hexyl nitrate (1.5), oleic acid (10.6), and high purity glyceryl monooleate (2.0). The resulting emulsion was stable at - 14 degrees C. Emission test was performed and result showed a dramatic drop in nitrogen oxides emission using the formulation.