Smokeless fuels are basically cleaner and less harmful types of combustion fuels for the environment. Smokeless fuels in most cases are man-made and have a reduced sulphur content that reduces the carbon and particle emissions during the burning process. They are designed to be a consistent size to provide longer burning time with higher radiating heat output that regular bituminous coals. In many cases they are also designed to generate less ash waste. Smokeless coals are not only suitable for use in smoke controlled areas, they can be used anywhere and are often an environmentally friendly substitute other forms of fuel such as wood products.