Wood Smoke Linked To Thousands of Deaths Annually, And It’s Coming From the Suburbs

Traditional Fireplaces Produce More Fine-Particle Pollution Than All Motor Vehicles Combined, Study Shows

Curling up by a crackling fireplace is a hallmark of a cozy winter evening. Unfortunately, however, telling research now suggests all that warmth and comfort is linked to an estimated 8,600 premature deaths each year in the United States. That’s a concerningly high number considering only 2% of homes use wood as their primary heat source.

Wood smoke contributes more than a quarter of all wintertime air pollution across the country, producing more fine-particle pollution than every car, truck, and bus on American roads combined. Those microscopic particles penetrate deep into the lungs and bloodstream, raising the risk of heart and lung problems.

Researchers from Northwestern University used computer modeling to track how wood smoke spreads across the country during winter months. Their paper is published in Science Advances.

Winter Air Gets Especially Smoky

In many areas of the country, the air outside on a cold January evening is probably polluted to some degree. A great deal of that pollution comes from wood smoke, making it one of winter’s biggest air quality problems. In Philadelphia, wood burning accounts for almost a third of winter air pollution. Denver sees even higher levels at 35%.

Wood Smoke Doesn’t Stay Where It Starts

Most people assume wood smoke is mainly a rural problem, with isolated cabins burning logs far from cities. The reality is actually the opposite. Urban residents breathe more than twice the wood smoke pollution as their rural counterparts.

Take New York City. Most wood burning happens in Yonkers and Long Island suburbs, not in Manhattan. Yet, smoke blankets more than three-quarters of the metro area, including the city center where hardly anyone burns wood at all. Wind carries suburban emissions into the densely packed urban core.

Even warm-weather cities aren’t immune. Los Angeles residents breathe wood smoke pollution too, with hot spots in neighborhoods like Pasadena.

The ‘Green’ Heating Method With a Dark Side

In some places, wood burning has been encouraged as a cleaner alternative to fossil fuels, with governments implementing policies to promote residential wood combustion as part of climate action plans.

However, health costs add up fast. Past research suggests wood smoke may be especially risky for health, with the chemicals in smoke carrying particularly high risks for cancer and lung disease.

Organic carbon from wood burning makes up nearly half of all wood smoke pollution, and represents a third of this type of pollution from all sources combined.

The Burden Falls Unevenly

Wood smoke doesn’t affect everyone equally. In 18 of America’s 20 largest metro areas, communities of color breathe more wood smoke than White neighborhoods, despite being less likely to burn wood themselves.

Black communities face higher death rates in the study’s modeling, in part because existing health conditions can make air pollution hit harder.

Philadelphia and Denver residents face the highest death rates from wood smoke pollution among major cities. Some southern cities with mild winters, including Miami, Phoenix, Atlanta, Dallas, and Houston, still see substantial numbers of deaths annually.

Geography matters. Mountains trap pollution in Denver, Seattle, and Los Angeles, letting wood smoke build up instead of dispersing into the atmosphere.

Small Changes Could Save Thousands of Lives

Since wood burning happens mostly in specific places during cold months, targeted restrictions could prevent thousands of deaths. Some communities already ban wood burning on days when air quality deteriorates, or prohibit older, dirtier wood stoves.

Considering only 2% of homes use wood as their main heat source, and about 8% more use it as a backup heating option, relatively modest policy changes could deliver major health benefits.

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Disclaimer: This article is based on a peer-reviewed study. The research involved computer modeling of winter wood smoke patterns and does not represent official health guidance. Individual health risks may vary.

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