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

Collage of two images: on left, wildfire smoke and fire in a Washington forest; on right, five farmworkers harvest lettuce in the heat under a canopy with hats and scarves.

Wildfire smoke and extreme heat projects win population health awards

DEOHS researchers and partners tackle health impacts of smoke and heat with new grants from UW Population Health Initiative

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A sunflower wilts in the afternoon sun.

Heat-related mortality risk is widespread across Washington state

Even in temperate areas of the state, heat-related deaths are a current public health concern, according to new UW research

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Diana Marquez stands in front of an enclosure of cows at a dairy farm with a notebook in her hands.

Building trust with farmworkers

DEOHS master's student in Occupational Hygiene interns with Washington State Department of Labor & Industries in the Yakima Valley

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A smoke plume rises from a wildfire on a hillside near a group of houses.

Planning for disaster

Disaster researchers gather at the University of Washington this week to consider how to integrate their research into future disaster response

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A worker rests on a grassy hill on a sunny day with his safety vest covering his face.

Staying safe in the heat

Extreme heat can be deadly. Get tips on caring for yourself and others from DEOHS researcher Tania Busch Isaksen

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A young woman with long black hair and a white jacket sits at an outdoor table.

Managing the health impacts of extreme heat

DEOHS student Juliette Randazza examines how smart public policy can protect public health in a warming world

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In the news

Trump EPA moves to repeal climate rules that limit greenhouse gas emissions from US power plants
June 11, 2025 | AP | Featured: Howard Frumkin View

Wildfire communication gaps persist for Spanish speakers in Washington. These groups are working to close them
May 30, 2025 | Northwest Public Broadcasting | Featured: Maria Blancas View

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