The first bus burning hydrogen to serve the tourist route in London is in operation and by mid-2011 will have added seven more.
The initiative is regarded as the foundation for the spread of the hydrogen throughout the country.
The bus is designed exclusively for London, the evaporation of water vapor comes out and has a range of 18 hours without need for refueling.
The buses are equipped with batteries storing electricity produced by a hydrogen element, a device that combines hydrogen and oxygen to produce both energy and water as a combustion product of the other.
Every year it is estimated that more than 4300 people lost their lives in London because of poor air quality, the cost amounting to 2 billion. pounds per year.