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several of the world's top athletes were at the beijing sport university on monday and some were worried about the threat of air pollution during the games. haile gebrselassie said he might skip the olympic marathon and opt for the 10,000 metres. soundbite: (english) "if it is serious, serious problem, of course you know, there is nothing better than life. most important, my top priority you know is to live, to keep my health, if something happens worst, i would better not to come." supercaption: haile gebrselassie world champion 400-metre hurdler, jana rawlinson of australia is another to have concerns. soundbite: (english) "the studies that the australian biomedical sports guys have done recently basically said to me that you cannot adapt to the pollution, but you can only adapt the climate change. so we are going to reduce the amount of the pollution that everybody has to uptake and therefore only have to go through the heats round with that. " supercaption: jana rawlinson ioc president jacques rogge has warned several times that endurance events would be postponed if air pollution presents a danger.