This is just a heads up for those with asthma, allergies and other respiratory issues.
In case you are not aware, WA state has been experiencing a significant wildfire season due to dry conditions. For the most part, weather conditions are such that smoke does not blow into the Seattle area. However, it does happen and can linger for several days, as demonstrated most recently by this past weekend.
Plan accordingly. Carry inhalers or other medications with you just in case. You will be fine inside the hotels and the Convention Center, but may suffer respiratory issues when outside if the smoke blows towards town.
You may want to monitor local TV news stations (King5.com, kirotv.com, q13fox.com, komonews.com) for any air quality alerts.
Also this for current air quality: http://airnow.gov/index.cfm?action=airnow.local_city&cityid=258