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Promet postaja eden največjih onesnaževalcev našega okolja, tako po svetu kot v Sloveniji. Največ težav povzroča v urbanih območjih. Posledice se kažejo v prometnih zastojih, hrupu, onesnaženosti zraka in povečanih vibracijah. Ljudje bodo še vedno uporabljali osebna vozila kot osnovno prevozno sredstvo, zato iščemo okolju bolj prijazna - alternativna pogonska goriva, kar je tudi osrednja tema diplomske naloge. Ugotavljamo, da bi bilo najbolj ekološko in zdravju bolj prijazno se prevažati z avtomobili na vodik, v kolikor bi le-ta bil proizveden z uporabo električne energije, ki bi jo pridobili iz obnovljivih virov. Vendar dokler to ni možno, je prehodno primerno gorivo stisnjen zemeljski plin. Pri vožnji z vozili na zemeljski plin nastaja zelo malo izpušnih plinov in prašnih delcev skoraj ni. Transport is becoming one of the biggest polluters of our environment in all countries - Slovenia is no exception. The biggest impact is most evident in the urban areas. Consequently in the cities, there are big traffic jams, noise, air pollution and increased vibration. There is no doubt that people will still use cars as a basic means of transport, so we are looking for more environmentally friendly - alternative fuels, which is the main theme of the thesis. We find that most organic and healthy would be transport by car with hydrogen fuel. But only in case that this fuel is produced by electricity gained from renewable energy sources. However, until this is not possible compressed natural gas is a good transitional fuel. Natural gas vehicles have very low exhausts emissions and dust particles.