The number of acres burned by wildfires every year has almost doubled since 1985. And the smoke from these fires now regularly pollutes the air for most of the country. It’s not simply smoke but many harmful chemicals because it comes from many types of fuels (like homes, cars, biomass, etc.). Problems with the heart, lungs, eyes, nose, and, more recently, the brain have been linked to wildfire exposure.

Both short-term and long-term exposure to wildfire smoke and other pollutants like ozone and diesel emissions can cause inflammation in the brain. We believe pollutants in the lungs cause the neurological effects. Previous research has suggested that breathing in particulate matter (PM) causes pulmonary proteolysis, creating fragmented peptides that enter the bloodstream and weaken the blood–brain barrier (BBB).

Climate Central, a non-profit group, says that every person in the US took in more harmful wildfire smoke in 2023 than in any other year since 2006. Studies show that over the last ten years, exposure has grown 27 times in the United States.

Pollutants from wildfire smoke are mixed together, but fine particulate matter (PM2.5) makes up most of it and is a significant health risk. A study of more than 1.2 million people in southern California over the course of ten years found that wildfire smoke raises the chance of dementia more than any other type of air pollution. Researchers indicate that wildfire smoke is more dangerous to brain health than other types of air pollution.

Fine particulate matter (PM2.5) is air pollution from industry, cars, and wildfire smoke. These are very small drops of solid and liquid matter in the air, 30 times smaller than the width of a human hair. The chance of getting dementia was much higher when people were exposed to PM2.5 from wildfire smoke than when people were exposed from other sources of air pollution. Smoke from other sources increases the risk of dementia, but not as much as smoke from wildfires.

Mental Health Consequences

On days with a lot of pollution, more people go to the hospital for depression, suicide attempts, and psychotic episodes. Study after study shows that children whose mothers were exposed to high amounts of particulates while they were pregnant are more likely to have motor and cognitive problems as adults.

One study is one of the first to look at the effects of particulate matter on teens, whose brains are still growing.

Data from 10,000 pre-teens in the Adolescent Brain Cognitive Development Study (ABCD), the largest US child health study, was analyzed. Two of the 21 study sites are at the University of Colorado at Boulder.

Researchers looked at parent questionnaires from four different times over three years and found that for both boys and girls, each extra day of exposure at unsafe levels increased the chance that they would have depression, anxiety, and other “internalizing symptoms” up to a year later.

But wildfire smoke doesn’t only affect the immediate area. While the exact distance depends on the wind and weather, smoke from wildfires can move hundreds of miles. This wide area has an effect on the air quality in places far from the fire, and the effects can last for weeks.

Smoke from wildfires, as previously noted, can have a significant effect on health. Some of the chemicals and small particles in smoke can impact the eyes, nose, and throat, making it hard to breathe, cough, and wheeze. If someone already has a breathing problem, like asthma, these signs can get worse.

How Can You Protect Yourself

It’s important to remember how the air quality is affected by the flames in the area, even if you are miles away. These are some simple things you can do to stay away from smoke and clean the air in your home and car.

1. Spend as much time as possible inside
Do not go outside as much, especially if you are working out when the air quality is poor. Inside is the best place to be when there is smoke. Keep a close eye on local news on the air quality. They often include a color-coded Air Quality Index (AQI) to help you decide how active you should be.

2. Close all the doors and windows
All of your windows and doors should be closed to keep smoke out of your home. Weather stripping or towels can fill in holes under doors and windows if you can. If your whole-house fan or window air conditioner does not have a HEPA filter, do not use them. They can bring smoke inside.

3. Use an air cleaner
If you have an air cleaner, especially one with a HEPA filter, use it to help clean the air inside your home. You might want to use portable air cleaners in the bedrooms and living rooms where you spend the most time. Do not use things that make ozone because it can make the air quality worse.

4. Create a room with clean air
Set aside one room as a “clean air room” if keeping your whole house smoke-free is hard. A HEPA air filter should be set up in a room with few windows and doors. During times of smoke, spend most of your time in this room.

5. Know how to use your air conditioner well
If you have an air conditioner, make sure it is set to bring in air from outside and move it inside. Keep the windows closed and, your car, set your air conditioner to the recycling mode to keep smoke out of your car while you drive.

6. Stay away from things that make indoor pollution worse
When the air quality outside is a concern, it is important to cut down on indoor pollution sources as well. Do not use gas stoves, burn candles, or smoke inside. The air quality inside can get even worse, and these actions can make the environment more dangerous.

7. Put on a mask if you need to.
If you have to go outside, wear a mask to keep out small particles. Wearing N95 respirators or KN95 masks can help protect you from dangerous particles in wildfire smoke. Scarves or masks made of cloth will not keep smoke out.

8. Keep an eye on air quality
You can check the air quality in your area in real time with apps or websites. There is a simple way to tell if the air is safe to breathe with the Air Quality Index (AQI), which helps you plan your day.

9. Drink plenty of water and look after your health
It is important to stay hydrated because wildfire smoke can irritate your lungs and make it harder to breathe. Your lungs and sinuses stay moist when you drink plenty of water. For people who already have conditions like asthma, make sure they have all of their medicines on hand. Also, do not wait to call their doctor if they have trouble breathing or other signs.

We are beginning to suffer through the effects of climate change and wildfires are a result. Living with these conflagrations may mean changes over a long period of time because climate change will be with us for decades, if not longer. Lifestyle changes are mandated if we expect to maintain our health when we need to interact with wildfire-induced pollution.