Here is the air monitor and weather update for Saturday (Sept. 29, 2012). For more information, check http://wasmoke.blogspot.com/.
Most of Western Washington except the Olympic Peninsula saw a little smoke and haze Friday, but the front that moved in last evening has returned air quality to “good” at all but two monitors. Most monitors at the Cascade foothills have shown declining levels of fine particle pollution over the last few hours in response to this front.
Expect clearing to continue through Saturday evening and bring some relief to the smoke-impacted communities of the Cascade foothills today. However, the smoke will blow through the Columbia Basin while dispersing. Winds will die down tonight and become more terrain-driven on Sunday and Monday, meaning nighttime and morning smoke in several areas with daytime clearing.
No easterly winds are expected, so there is no threat of Idaho wildfire smoke over the next few days, nor is smoke likely to move into Western Washington. A strong cold front is expected to move through Eastern Washington around Tuesday, but it doesn’t appear to contain a huge amount of precipitation.
The National Weather Service issued an Air Quality Alert for all of eastern Washington: http://forecast.weather.gov/wwamap/wwatxtget.php?cwa=otx&wwa=air%20quality%20alert
The Governor’s ban on all outdoor burning in Eastern Washington continues through midnight Sunday. The ban does not apply on tribal lands where the U.S. Environmental Protection Agency has jurisdiction.