OneWorld US: Air quality concerns in Beijing have prompted the world’s record holder in the marathon to pull out of the premiere long-distance running event at this year’s Olympic Games. Haile Gebrselassie, who has asthma, announced Monday that he would not risk his health by taking part in the 26.2-mile race in the Chinese capital, which is notorious for its poor air quality. In Beijing, respiratory particulate levels have averaged three to four times U.S. safety levels, according to the …