How to Keep Indoor Air Clean During Wildfire Smoke

Wildfire smoke can travel hundreds of miles, filling the air with tiny particles that may pose serious health risks. As smoke from large wildfires continues to affect communities across North America, health experts recommend taking steps to improve indoor air quality and reduce exposure.

Use Air Conditioning the Right Way

If your home has central air conditioning, experts recommend replacing filters regularly and using MERV 13 or higher filters if your system supports them. Set the system to recirculate indoor air and close any vents that bring in outside air during smoky conditions.

For homes with portable air purifiers, choose a HEPA filter that captures fine particles without producing ozone. If you only have one purifier, place it in a room where your family spends the most time.

DIY Air Filters Can Help

A low-cost air cleaner can also be made using a box fan and high-efficiency furnace filters. Researchers say properly assembled DIY filters are effective at removing fine smoke particles and can provide meaningful protection when commercial air purifiers are unavailable.

Keep Smoke Outside

Seal gaps around doors and windows with towels, weather stripping, or tape to reduce smoke entering your home. Avoid activities that create indoor pollution, including burning candles, using fireplaces, or cooking on gas stoves when air quality is poor.

If using a window air conditioner, make sure it is well sealed and set to recirculate indoor air. Homes without air conditioning should consider spending time in public buildings such as libraries or shopping centers that offer clean, cooled air.

Watch for Health Symptoms

Wildfire smoke exposure can cause coughing, shortness of breath, chest tightness, headaches, and irritation of the eyes or throat. Anyone experiencing severe breathing problems or persistent wheezing should seek immediate medical attention.

Health experts say even simple measures such as improving filtration, limiting outdoor air entry, and using air purifiers can significantly reduce exposure to harmful wildfire smoke indoors.