Biodiesel is an ester (like vinegar) that can be manufactured from different types of oils such as vegetable oils and animal fats. Each year about 30 million litres of biodiesel is produced in the USA recycled cooking oils and soybean oil.
Biodiesel is currently not available to the public. Some federal, state and transit fleets, as well as tourist boats and launches, the use of biodiesel alone or mixed with another fuel.
Biodiesel is generally used as a mix-20 percent biodiesel and 80 percent petroleum diesel known as B20. B20 can be used in a diesel engine with a major engine of change.
It is also a growing interest in biodiesel which workers are exposed to diesel exhaust in the air to control local pollution near airports, and the locomotives to make limited use unless emissions can be reduced.