You can monitor the fire here.
http://www.inciweb.org/incident/3660/ 5 days ago it was only 5% contained and today it's 23%. It's burning 10,000-25,000 acres a day. Depends on what the winds are doing. It's a HUGE fire so anything can happen. There will certainly be smoke in the air for the next few weeks. Some days will be better than others depending on how the winds blow. When I was in Mammoth Lakes at the end of July/early August there was a fire 35 miles away with 20,000 acres burning (80% smaller than this current one) It was either real bad in the morning and clear up in the evening or good in the morning and bad in the evening. All depends on the winds.
Last year I did LeadmanTri 250 in Bend, OR and sections were smokey. It wasn't that bad. In 2003 at Ironman Canada there were fires. They made the bike 3 loops (instead of 1 loop) to avoid the fire and real smokey areas.
Time is on our side right now and hopefully they can get the fire contained. Not sure what Ironmans protocol is...maybe a week out they will hopefully say things are fine. If the ironman was this weekend it wouldn't happen though.
http://www.MattRussellTri.com -Pro Triathlete
-Tri Coach