Wood Smoke a Significant Source of Winter Air Pollution
The comforting image of a crackling fire on a cold night obscures a surprising reality: burning wood in homes contributes substantially too winter air pollution across the United States. New research from Northwestern University reveals that residential wood burning accounts for more than one-fifth of Americans’ winter exposure to dangerous fine particulate matter (PM2.5), despite only 2% of households relying on wood as their primary heating source.
These microscopic particles can penetrate deep into the lungs and bloodstream, and long-term exposure is linked to serious health issues like heart disease, lung disease, and premature death. Researchers estimate that pollution from wood burning is associated with approximately 8,600 premature deaths annually.
Cities and Communities of Color Face Greater Risk
The study found that urban areas experience a disproportionate impact from wood smoke. People of color are also particularly vulnerable, experiencing higher exposure levels and health risks despite burning less wood themselves. Researchers attribute this disparity to higher baseline mortality rates and the lingering effects of past discriminatory policies.
Reducing wood burning could significantly improve air quality and save lives, the study suggests.
“Long-term exposure to fine particulate matter is associated with an increased risk of cardiovascular diseases,” said Kyan Shlipak of Northwestern University, who led the study. “Our study suggests that one way to substantially reduce this pollution is to reduce residential wood burning. Using choice appliances to heat homes instead of burning wood would have a big impact on fine particulate matter in the air.”
Why Wood Burning Often goes Unnoticed
While wildfire smoke frequently grabs headlines, the pollution from home heating often receives less attention.
“We frequently hear about the negative health impacts of wildfire smoke, but do not often consider the consequences of burning wood for heat in our homes,” said Daniel Horton, the study’s senior author and an associate professor at Northwestern’s Weinberg College of Arts and Sciences. “Facilitating a transition to cleaner heating sources could lead to outsized improvements in air quality.”
The study was published jan. 23 in the journal Science Advances. For decades, air quality research has primarily focused on emissions from vehicles, power plants, agriculture, and industry.
