A cleaning plan for Bellevue allergy households built on the Seattle area pollen chart: tree pollen from January, grass and weeds into September, plus what to do when wildfire smoke drifts in.
In the Seattle area, allergy season does not wait for warm weather. Hazelnut trees release pollen in January, and by the time most people think of spring the alder and cedar seasons are well underway. Grass and weed pollen then carry on into September.
For a household with allergies, that means the cleaning routine matters for most of the year, not just a few weeks. This guide lays out the local pollen sequence, where pollen settles indoors and how often to clean to keep it down.
The Northwest Asthma & Allergy Center publishes the Seattle area pollen chart, and the daily count that local media report comes from its office. Its counts come from two counting machines on the roof of its office in Northgate, and it notes that rain can lower the count. For Bellevue households, the sequence it shows looks like this.
Bellevue calls itself a city in a park, with nearly 100 parks spread over more than 33 square miles between Lake Washington and Lake Sammamish. Green corridors such as the Lake Hills greenbelt, more than 172 acres of wetland between Phantom Lake and Larsen Lake, run right through residential neighborhoods. Bridle Trails is heavily wooded, with nearly two-thirds of the area covered in second-growth timber.
All of that green space is part of why people want to live here, and it is also why the trees, grasses and weeds on the chart above are never far from a window. Pollen comes in through open windows and doors, on clothes and hair, and on pets that spend time outside.
Pollen is light and sticky. It lands on the flat surfaces closest to where air moves, so the places to focus are predictable. Dry dusting with a feather duster only lifts it back into the air; a damp microfiber cloth or a vacuum with a sealed HEPA filter traps it instead.
The Puget Sound Clean Air Agency says wildfires typically occur in the warmer, drier summer months and expects more smoke to reach the Puget Sound region. Smoke irritates the same airways that pollen does, and in late summer the two can overlap with the end of the grass and weed season.
On smoke days, the agency advises keeping windows and doors closed in a clean room and using a HEPA filter in an air cleaner or HVAC system. Once the air clears, damp wipe the surfaces where the fine particles settled, and change or clean filters that have darkened.
From February through June, when alder, cedar and the spring trees overlap, a weekly Recurring House Clean keeps pollen from building up on surfaces and floors. July through September, when grass and weeds continue and smoke is possible, bi-weekly with weekly dusting by the household usually works. From October through December the counts drop and the rain does some of the work, so stepping back to bi-weekly or monthly can make sense.
Each recurring visit dusts reachable baseboards and blind slats, which is where pollen hides in plain sight. A One-Time Deep Clean adds wet-wiped blinds, ceiling fans and light fixtures wiped in place and couch crevices vacuumed, which makes it a good reset at the start of the heavy tree season. The recurring cleaning guide explains each plan, and the seasonal calendar covers the rest of the year.
The questions Bellevue homeowners ask most often about this topic, answered plainly.
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