Wildfire smoke leaves harmful gases in floors and walls − air purifiers aren’t enough, new study shows, but you can clean it up

When wildfire smoke turns the air brown and hazy, you might think about heading indoors with the windows closed, running an air purifier or even wearing a mask. These are all good strategies to reduce exposure to the particles in wildfire smoke, but smoky air is also filled with potentially harmful gases. Those gases can get into buildings and remain in the walls and floors for weeks.

Getting rid of these gases isn’t as simple as turning on an air purifier or opening a window on a clear day.

In a new study published in the journal Science Advances, colleagues and I tracked the life of these gases in a home exposed to wildfire smoke. We also found that the best way to get rid of the risk is among the simplest: start cleaning.