Nice article in today's Washington Post titled "Gray Wall Dims Hopes of 'Green' Games"
Two weeks ago, two Ethiopian middle-distance running champions announced they would forgo some events because of the "disgusting weather and air pollution." New Zealand and American athletes say they will wear face masks if necessary. Even Jacques Rogge, president of the International Olympic Committee, warned that some endurance sports might be postponed if the pollution gets too bad.
Also this article titled "A 'disgusting' Beijing Repels Olympic Athletes" quotes Kenenisa as saying that Beijing has “mixture of disgusting weather and air pollution" and that he will not try to double. Meseret Defar says that she will have to change her exercise regime and routines radically and will not attempt to double.