some of the pollution is from a storm in the sahara desert. they say it's a mix of industrial pollution and the sahara dust. one guy on a bike wore a mask, apparently to help him breathe, or just as a fashion statement, who the hell knows? government officials have warned people with health conditions or heart or lung conditions, especially, to avoid strenuous physical exercise in the next few days. they say the pollution level could climb to the very top of their scale. for the first time ever, north korea is letting tourists run in the annual pyongyang marathon. until now, only professional runners could enter that race. travel agencies report hundreds of people from around the world have signed up for the event. one catch. you have to finish the 26.2-mile run in four hours, or officials will pull you from the race. the event is set for next weekend. and then they make you cut your hair like the dear leader and all that. quite a show. search teams have struck out