To provide a low-pollution light oil which emits little amount of the black smoke when used on a diesel engine.

The low-pollution light oil is formed by being mixed with an alkyl ester of a fatty acid of 3-40 wt.% and alcohols of 5-30 wt.%, each on the basis of the total weight. The alkyl ester of the fatty acid is one selected from the group consisting of an alkyl ester of palm oil fatty acid, an alkyl ester of rapeseed oil fatty acid and an alkyl ester of soy-bean oil fatty acid, preferably methyl ester of palm oil fatty acid. The alcohols are preferably a mixture of two or more kinds of alcohols selected from the group consisting of ethanol, n-propanol, n-butanol, isobutyl alcohol, t-butyl alcohol, n-pentyl alcohol, t-pentyl alcohol, isopentyl alcohol, isopropyl alcohol, ethylhexanol, and 2-methyl-1-propanol (isobutanol).