Wildfire Smoke Season Prep for South Sound Homes: A Practical Checklist

The best time to prepare for wildfire smoke is before it arrives. In the South Sound, that means getting your filtration, ductwork, and clean-air plan in order by early summer — because once the sky turns orange, filters sell out and everyone calls at once. Here is the checklist we recommend, plus the playbook to follow when smoke actually settles in.

Why does Puget Sound get smoke from June through October?

Most of the smoke that reaches Lakewood and the surrounding area does not come from local fires. It drifts in from fires east of the Cascades and from British Columbia, carried by shifting summer wind patterns. When it arrives, our marine air layer can trap it near the ground for days, so a smoke event that starts hundreds of miles away can sit over the South Sound for most of a week. That is why preparation matters more than reaction: the smoke decides when it leaves, not you.

The pre-season checklist

• Verify your filter fit. Pull the filter and check that it seats snugly with no gaps around the frame. Smoke particles are tiny; air that slips around the filter is air that never gets cleaned. Note the exact size so you can stock spares.
• Upgrade toward MERV 13 if your blower can handle it. MERV 13 filters capture far more fine smoke particles than basic filters, but they also add airflow resistance. Not every system tolerates that restriction — an older blower or an undersized filter slot can strain. Have a technician confirm what your system can handle before you upgrade.
• Seal obvious duct leaks. Ducts running through a crawlspace or attic can pull smoky air in through gaps and deliver it straight to your rooms. Sealing visible leaks at joints and connections keeps the system moving filtered air instead of drawing in unfiltered air.
• Plan a clean-air room. Pick one room — usually a bedroom — where doors and windows seal well, and plan to concentrate your cleanest air there during heavy smoke.
• Know how to set your system to recirculate. Find the fan setting on your thermostat and, if you have a ventilation system, learn how to close or pause the outdoor air intake. Practice now, not at midnight when the smell of smoke wakes you up.
• Consider a portable HEPA unit for bedrooms. A portable HEPA air cleaner sized for the room is a strong complement to central filtration, especially where people sleep.

What do I do while the smoke is here?

1. Keep windows and doors closed, and check the AQI before opening anything — evenings can look clear while the air is still unhealthy.
2. Set the fan to ON instead of AUTO. Continuous fan operation runs air through the filter around the clock, not just when heating or cooling calls, and every pass removes more particles.
3. Pause outdoor-air ventilation. Fresh-air intakes and ERVs that normally help your air quality are pulling in smoke during an event. Switch them off or to recirculate until the AQI recovers.
4. Retreat to your clean-air room with the portable HEPA running if the house starts to smell smoky.

After the season: replace the filter

A filter that carried you through a smoke event has done heavy work and is partly loaded. Replace it once the smoke season winds down, even if it looks passable — a loaded filter restricts airflow and protects you less.

When do whole-home upgrades make sense?

If someone in your home has asthma or another respiratory condition, if smoke events leave your house smelling smoky for days, or if you rely on open windows for summer cooling, it is worth evaluating whole-home filtration, a media air cleaner, or an ERV with proper smoke-mode controls. These systems clean every room, not just one, and they work year-round against pollen and dust too.

Get your home smoke-ready before the season

A short visit can confirm whether your blower supports a MERV 13 upgrade, check your ducts for leaks, and map out a whole-home filtration plan if you need one. Book an indoor air quality consultation and go into smoke season with the checklist already done.