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*This outlook was produced through  the support of the Okanogan/Wenatchee National Forest and the Incident Management Teams working on local fires to help inform nearby communities of smoke impacts.

Fire activity has decreased significantly this past week, so smoke should be limited to areas immediately downwind of smoldering fires. With no big warm up expected and moist overnight humidity, fire growth should be minimal.  Furthermore, there is potential for rain in British Columbia (including Vancouver Island) Sunday night and Monday which could further decrease wildfire activity there.  Most areas of Washington state should have Good air quality this Labor Day weekend. Western Washington: It will be relatively cloudy and cool over most of Western Washington for the next couple days, but Sunday should be mostly sunny in the low to mid 70s.  Monday morning has the potential for some light rains, especially as you get closer to the Canadian border.  Air quality should be  Good  to  Moderate  in most places for the weekend. Central and Eastern Washington: Due to the proximity to local wildfires, we continue to see air quality fluctuate between Moderate and Unhealthy in areas like

*This outlook was produced through  the support of the Okanogan/Wenatchee National Forest and the Incident Management Teams working on local fires to help inform nearby communities of smoke impacts.

*This outlook was produced through  the support of the Okanogan/Wenatchee National Forest and the Incident Management Teams working on local fires to help inform nearby communities of smoke impacts.

Just to be clear, the title applies to current smoke levels. Here is this morning's satellite picture showing areas of smoke (clouds are whiter, smoke is light gray). Light smoke, mostly from BC drifting over the Puget Sound lowlands is causing some areas of Moderate air around the central Sound. Chelan and Okanogan County fires are fouling up the Methow and nearby communities but thankfully haven't returned those areas to the conditions they saw last week. Though you can't see it clearly, Vancouver Island fires are sending a plume that is sitting offshore waiting to come inland when the winds turn west/ southwest on Wednesday. The Canadian FireWork model seems to be the only one getting most of these details right, so here's the prediction for Wednesday afternoon (left) and Thursday morning (right), as the winds shift:   What this means for western WA It is possible that air will be compromised in southwest WA and the central Sound on Wednesday, but we're not expec

*This outlook was produced through  the support of the Okanogan/Wenatchee National Forest and the Incident Management Teams working on local fires to help inform nearby communities of smoke impacts. A version of the Outlook with live links is available here: LINK

Wow, does anyone remember when we last saw so many green dots across the state's air quality monitoring map? The clouds, wind and drizzle over the weekend got us great bang for the buck and reduced fire activity in the Cascades and also in British Columbia. Since there is no imminent danger of returning to the terrible conditions we've all endured, we're asking you to please take a moment and send some feedback on this blog. Our aim is to provide the public with wildfire smoke-related air quality information, and we'd like to make sure we're doing that effectively. This survey will take no more than 5 minutes to complete. Thank you very much!

*This outlook was produced through  the support of the Okanogan/Wenatchee National Forest and the Incident Management Teams working on local fires to help inform nearby communities of smoke impacts.

The cooler weather, onshore winds, and scattered rain will continue today as the clouds move east.  We should be back to clear skies on Monday afternoon and Tuesday.  Not for long though!  More cloudy and cool weather is expected to roll in on Wednesday.   Thanks to the weather, many Washington residents will continue to see relatively good air quality today and beyond.  However, it can be difficult to assess fire and smoke activity with all these clouds since satellites do not have a clear view. Most of Western Washington is experiencing Good air quality, but a fire on JBLM has been sending smoke north and causing Moderate to Unhealthy air quality around the Seattle area.  The fire is contained but could continue to generate modest smoke that impacts nearby cities. Northerly winds are expected on Monday, which could blow a little Canadian smoke into our state, but nothing like we saw earlier this year.  Residents in the Spokane area could also see smoke blow in from Idaho and Montan

*This outlook was produced through  the support of the Okanogan/Wenatchee National Forest and the Incident Management Teams working on local fires to help inform nearby communities of smoke impacts.

*This outlook was produced through  the support of the Okanogan/Wenatchee National Forest and the Incident Management Teams working on local fires to help inform nearby communities of smoke impacts.

The westerly winds cleared out all that stagnant smoke across the state yesterday, as expected.  Most of us in Washington have been able to get at least a few hours of Good air at times.  We are seeing less severe air quality problems around the state, with more localized patterns coming into play.  There is also some significant rain expected for the North Cascades on Sunday which is always welcome this time of year! Western Washington The Vancouver Island fires continue to generate smoke that is causing Moderate to Unhealthy smoky conditions at times around the west and north coastal areas of the Olympic Peninsula.  Port Angeles looks to be getting the worst of it.  Other parts of Western Washington have also been getting intermittent smoke, which is Moderate to  Unhealthy for Sensitive Groups .   Thurston, Mason, and Kitsap counties are likely experiencing a mix of light to moderate smoke from the Maple Fire and the Vancouver Island fires.   Snohomish, King, and Pierce counties

Most studies about reducing indoor smoke have used HEPA air purifiers. Some HEPAs are more efficient than others at removing very small particles (PM2.5) including smoke.  Efficiency also depends on how large the volume of the indoor air is and on the rate of outdoor-to-indoor air infiltration (typical houses are quite permeable).  HEPAs have been observed to lower PM2.5 concentrations in homes by 26 to 88% relative to outdoor air. This comment was coordinated with WDOH.    For more information see: Barn et al. Portable air cleaners should be at the forefront of the public health response to landscape fire smoke.  Environmental Health (2016)    https://ehjournal.biomedcentral.com/articles/10.1186/s12940-016-0198-9 EPA: Guide to Air Cleaners in the Home, 2nd Edition, Portable Air Cleaners, Furnace and HVAC Filters (July 2018)   https://www.epa.gov/sites/production/files/2018-07/documents/guide_to_air_cleaners_in_the_home_2nd_edition.pdf

There isn’t any  published research yet about long-term physical effects of wildfire smoke on people in affected area communities, and not much about them in wildfire-fighters, either.  However, wildfire-fighters are known to experience chronic lung and systemic inflammation from smoke that probably contributes to development of respiratory diseases in some cases. Wildfire smoke particulate matter is made of some of the same chemicals that human-caused particulate matter is made of, but there are some chemical differences between them.  Because of the differences and lack of wildfire smoke research, we don't know if the smoke can exacerbate autoimmune diseases like human-caused particulate matter does.