Other than carbon dioxide from bioethanol car

It is known that bioethanol is a greener, sustainable and renewable fuel which helps to reduce the greenhouse gases that contribute to global warming. A 10% ethanol blends can reduce greenhouse gas emissions by 12-19%. The carbon dioxide's provenance is a crucial factor in this reduction. Other emissions concerned are nitrogen oxides, particles, and hydrocarbons, which are also lower lowered when you run a car on bioethanol. Modern gasoline cars are already so clean that these improvements are of marginal importance. But the improvements are significant for diesel cars. The only measurable emission that increases with alcohols is aldehydes. With current catalysers, the level is so low that this is negligible.