Reuters: Beijing is aiming for more "good air days" in 2008 as it prepares to host the Olympics in August, a senior official said on Friday, with the city’s notorious pollution a major concern for athletes and organizers. Beijing recorded 244 "blue sky days" by December 28 this year, a day short of its 245-day target. The standard of a "blue sky day" has not been widely recognized by international scientists. "I predict that we will be able to meet …