The health effects of extreme heat

A construction worker rests on grass with a safety vest over his face.

How our research is contributing to the public health response

In the United States, heat-related mortality is the number one weather-related killer—and these deaths are nearly all preventable. As global warming continues, scientists predict extreme and dangerous heat waves will be much more common.

The UW Department of Environmental & Occupational Health Sciences (DEOHS) is at the leading edge of research into how extreme heat affects people’s health. We particularly focus on those who are most vulnerable to the health risks, including farmworkers, outdoor laborers and the elderly.

Our research is also identifying new ways to help communities adapt to heat through risk communication, evidence-based policies, land-use strategies and other approaches.

Learn more about this research led by our Center for Health and the Global Environment, Collaborative on Extreme Event Resilience and the Pacific Northwest Agricultural Safety and Health Center, all part of DEOHS.

Our impact

A person harvests plants in a field exposed to direct sun with mountains and trees in the background.

Deforestation threatens worker health and productivity

Heat limits worker productivity in tropical deforested areas, according to new study from DEOHS, The Nature Conservancy and others

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3 people wearing face masks stand next to weather monitoring equipment inside a chain-link fence.

Heat, fire, smoke and health in Washington’s ag industry

DEOHS researchers investigate the combined health effects of wildfire smoke and heat on Washington’s agricultural workforce and test strategies to protect workers and crops

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A wilting sunflower surrounded by dried out plants.

A hotter future could be deadly for many

US deaths due to heat exposure may markedly increase in a warming climate, according to research from DEOHS and collaborators

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A group of people kneeling or leaning over green shrubs in the sun.

Heat risk for farmworkers

US agricultural workers will see unsafely hot workdays double by 2050, says new UW, Stanford study

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3 part image showing Italian fields, a man in Kenya with water bottles, and a windswept beach in Dominican Republic

DEOHS faculty win global innovation awards

Funds will support international health studies on heat waves, natural hazards and sustainable food

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A toddler girl stands outside in a park with fallen leaves.

The lifelong health impacts of business as usual

Climate change is already damaging the health of the world’s children and threatens lifelong impact, says DEOHS co-author of Lancet report

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In the news

Trump administration pulls plug on UW climate research partnership
May 9, 2025 | The Seattle Times | Featured: Esther Min View

Exclusive: documents reveal how NIH will axe climate studies
May 8, 2025 | Nature | Featured: Kristie L. Ebi View

In WA and beyond, Trump’s war on science endangers the most vulnerable
May 5, 2025 | The Seattle Times | Featured: Kristie L. Ebi View

Research Spotlight: The Center for Health and the Global Environment
May 2, 2025 | The Daily | Featured: Jeremy J Hess, Kristie L. Ebi View

Premier climate study frozen by Trump administration as researchers get the boot
April 30, 2025 | KUOW | Featured: Kristie L. Ebi View