Based on the increasing need of energy for the future and the related risks to the environments due to burning of fossils fuels, hydrogen is seen as an efficient and application related clean energy carrier that may be derived from renewable energy sources. A variety of applications connected with production and use of hydrogen and the related risks have been identified, and a survey has been conducted among a number of experts as an internet exercise for unveiling the potential lack of necessary knowledge in order to handle hydrogen in a safe way concerning the various applications.

The main results concern hazardous situations related to release and explosions of hydrogen in confined and semi-confined areas, tunnels and garages, and mitigation of hazardous situations, i.e. preventions of accidents and reduction of consequences from accidents happening anyway.