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It's an interesting idea of using atmospheric air to run car. I don't know much about the technology. According to BBC's report it's by French inventor Guy Negre (who used to work in F1).The air is stored as compressed air in carbon-fiber tank in the chassis.The car weights 350kg with the air tank that takes just 3min to fill (much quicker than charging battery cars) with a mileage of about 120 mpg.About the fear of explosions from the compressed air Mr Negre says there's no issue with safety - if the air-car crashes the air tanks won't shatter - they will split with a very loud bang. "The biggest risk is to the ears."According to the inventor Guy Negre the cars will be in market by next year because of the financial backing from the Indian company TATA.Link to transcript of the video:-http://news.bbc.co.uk/1/hi/sci/tech/7241909.stm