How Smoke Affects Indoor Air
Fine particulate matter (PM2.5) from wildfire smoke penetrates buildings easily. Without intervention, indoor air quality can match hazardous outdoor levels.
Upgrading Your Filtration
Replace standard filters with MERV 13 or higher—these capture most smoke particles. HEPA filters provide even better protection but require compatible systems.
Running Your Fan Continuously
Set your thermostat fan to "ON" instead of "AUTO" during smoke events. This continuously filters air even without heating or cooling.
Sealing Your Home
Check window seals, door weatherstripping, and close fireplace dampers. Cover gaps around AC window units with plastic and tape.
Portable Air Purifiers as Backup
For bedrooms and high-occupancy rooms, HEPA air purifiers provide additional protection. Run them on high during worst air quality days.
Filter Replacement After Smoke Events
Smoke-laden filters clog quickly. Check and replace filters more frequently during and after wildfire season—sometimes weekly during severe events.