Smoke outside, safer air inside? What N.C. residents need to know

August 3, 2026 - 06:37

As wildfire smoke drifts into North Carolina, whether from local blazes or fires burning hundreds of miles away, many people are asking the same question: is the air inside my home really safer? The short answer is yes, but only if you take a few deliberate steps. Health officials and air quality experts say that indoor spaces can offer significant protection, but they are not automatic shields.

The key is to create a barrier against fine particulate matter, known as PM2.5, which can penetrate deep into the lungs. These tiny particles are what make smoky air hazardous, and they can easily slip through open windows, doors, and even gaps around older window units. To keep them out, experts recommend sealing your home as tightly as possible. Close all windows and doors, and if you have a central HVAC system, set it to recirculate mode so it pulls air from inside rather than drawing in smoky outdoor air. If you use a window air conditioner, check that the seal between the unit and the window frame is snug, and close the fresh air vent if it has one.

For extra filtration, a portable air cleaner with a HEPA filter can make a big difference in a single room. Look for one that matches the size of the room you spend the most time in. If you do not have a store-bought purifier, a DIY box fan filter can work in a pinch, though it should never be left running unattended. Also, avoid activities that add particles to the air indoors, such as burning candles, using a gas stove for long periods, or vacuuming without a HEPA filter, since that can stir up settled dust.

When smoke levels are very high, even indoor air can become unhealthy after a few hours. That is when you might want to consider a "clean room" strategy, picking one room with the fewest windows and doors and running a purifier there. Keep pets inside too, as they are also vulnerable to respiratory irritation. Finally, pay attention to local air quality alerts and follow guidance from the state's environmental agency. If you have asthma, heart disease, or are pregnant, check with your doctor about extra precautions. The goal is not to seal yourself in forever, but to ride out the worst of the smoke with as little exposure as possible.