BEIJING – 1 the smoggiest day here 2 the past week, International Olympic Committee president Jacques Rogge 3 Chinese authorities Thursday, 4 they had “done everything feasible and humanly possible” 5 the 6 for the Olympics. “ The fog you see 7 on the basis of humidity and heat,” Rogge said 8 a news conference. “It does not mean to say 9 this fog is the same as 10 . It can be pollution, but the fog doesn’t mean 11 that it is pollution. “ Of course, we prefer clean skies, but the most important thing is the 12 of the athletes being protected.” Rogge said that the I.O.C. could 13 events because of poor air quality 14 72 hours before the events, 15 ones like road cycling, triathlon and the marathon in which 16 would be most affected by noxious air because of their prolonged exposure to it. For now, 17 , Rogge said: “It is safe for the athletes.” On the eve of the first Olympics 18 in China, the air was soupy and gray, with the air quality rating reaching 95, well 19 air standards in the United States. Anything below 101 qualifies as a Blue Sky day here, 20 the standards set to monitor air quality for the Olympics.