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• Posted August 9, 2021

Climate Change Worsens Wildfires, Bringing Poorer Health to All

Smoke from wildfires burning along the West Coast is choking the entire United States, reminding everyone of the hazards of climate change.

But that haze isn't just stinging your eyes and choking your breath -- it poses a direct threat to your health, experts say.

Wildfire smoke has been shown to increase risk of heart attacks and strokes, as well as lung ailments like asthma, American Lung Association spokesman Dr. John Balmes said in a video interview with HealthDay Now.

"We've also learned over the last few years that cardiovascular disease can be exacerbated by wildfire smoke," said Balmes, a professor of medicine with the University of California, San Francisco, and a professor of environmental health sciences with the University of California, Berkeley.

"People with coronary artery disease, the kind of heart disease that causes heart attacks, or cerebral vascular disease, the kind of disease that causes strokes, there could be exacerbations of heart attacks and strokes caused by exposure to wildfire smoke," Balmes continued.

The Bootleg wildfire in southern Oregon continues to burn, encompassing 413,000 acres and rising, according to the U.S. Forest Service. Across the border, the Dixie wildfire in northern California has scorched more than 278,000 acres and continues to spread. The combined Dixie and Bootleg fires are more than three times the size of New York City.

"Over the past five to seven years, we have seen the intensity and the frequency, the size, the destruction and the death toll raising each and every year. Each year surpasses the year before," Mike Ming, staff chief of Cal Fire's behavioral health and wellness program, told HealthDay Now.

These huge wildfires fill the air with tiny particles that wind up deep in the lungs, contributing to a wide range of respiratory illnesses, Balmes said. The fires also create ozone smog pollution, which places stress on the heart and lungs.

A Stanford University study recently estimated there were 1,200 to 3,000 excess deaths between August and September 2020 in northern California, due to bad air quality from wildfires during that time period, Balmes said.

"We're also concerned about increases in risk for respiratory infections in everyone, not just people with preexisting heart and lung disease. That's particularly important in the midst of a pandemic," Balmes said. "Now there are data emerging that air pollution in general and wildfire smoke can increase the risk of COVID-19."

Additionally, the smoke from these wildfires can contain additional pollutants like chemicals, heavy metals and harmful toxins, Peter DeCarlo, an associate professor of environmental health engineering at Johns Hopkins University, told HealthDay Now.

"In addition to burning forests, you're burning urban areas and places where people live," DeCarlo said. "When you start to burn people's homes, you're not only burning wood and grass and leaves anymore. You're also burning things like laptops and appliances and paint and plastics and other things.

"In addition to the typical emissions from forest fires, you're now layering in additional toxicants and things that can be dangerous for people to breathe," DeCarlo added.

Wildfires fouling the air are directly linked to climate change, DeCarlo said.

"Climate change has multiple effects, and I think the one people are most familiar with is higher temperatures, but climate also changes precipitation patterns," DeCarlo said. "What we're seeing is an incredibly dry mountain west and western United States, and that leads to more fuel for fires, which can then burn longer and hotter than they would otherwise in a wetter scenario."

Unfortunately, climate change has gained so much momentum that even immediate action to clean the air will be too little, too late, DeCarlo said.

"It's going to keep going," DeCarlo said. "Even if we shut down all of our greenhouse gas emissions right now, we're still dialed in for changes over the next couple of decades."

In the meantime, DeCarlo suggests that people limit outdoor activities and exercise on days when the air quality index reaches levels of unhealthy or worse, particularly if you have heart or lung problems.

"Activities that make you breathe more are going to make you breathe more air pollution at those higher levels," DeCarlo said.

More information

The U.S. Environmental Protection Agency has more on fire smoke and your health.

SOURCES: John Balmes, MD, professor, medicine, University of California, San Francisco, and professor, environmental health sciences, University of California, Berkeley; Mike Ming, staff chief, Cal Fire's behavioral health and wellness program; Peter DeCarlo, PhD, associate professor environmental health engineering, Johns Hopkins University, Baltimore