East Midlands Airport is pioneering environmentally-friendly shuttle buses powered by organic waste.
The Castle Donington airport is thought to be the first in the world to trial the Liquid Biomethane-powered vehicles for its passenger transfer buses.
Over the next six months the carbon neutral vehicles will be compared to existing diesel vehicles.
Airport officials said they are halfway to their target of becoming carbon neutral by 2012.
'Air quality improvements'
The gas used to power the buses is produced by the decomposition of biomass, such as food by-products.
The gas is extracted from landfill sites or by-products produced by industries like food manufacture.
Officials hope the use of the fuel will result in air quality improvements, a reduction in CO2 emissions and reduced costs.
Neil Robinson, director of sustainability, said: "We have always put the importance of our local community and the environment around us at the centre of our plans.
"We have made significant efforts in recent years to mitigate the environmental impacts of our operations and we are really proud to be launching another airport first."