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

Families paying in fountain with the words 'Special Feature' over the top.

The heat is on: How to protect health in extreme heat

DEOHS is collaborating with cross-sector partners to prepare for a hotter future in the Pacific Northwest

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Utility workers in cherry pickers work on electrical power lines.

These four regions of the US are hardest hit by power outages

Prolonged power outages plague regions already facing climate and social vulnerability, new study shows

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The Space Needle in the foreground with Seattle neighborhoods and a bright setting sun over Puget Sound and the Olympic Mountains in the background.

Washington state’s 2021 heat wave led to previously uncounted deaths from injury

Heat wave contributed to 159 excess injury deaths over three weeks, new study led by DEOHS faculty member shows

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Three youth volunteers from Duwamish Valley Youth Corps smile wearing yellow safety vests, two giving a thumbs up, in a Duwamish Valley neighborhood in Seattle.

Empowering youth to seek climate solutions in their communities

DEOHS and Duwamish River Community Coalition join new program engaging Latino and Indigenous youth in community climate impacts

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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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In the news

Heat waves are getting names and ranks. Scientists aren’t sure it makes a difference.
June 28, 2024 | E&E News | Featured: Kristie L. Ebi View

Visualized: the parts of the US where summer heat has risen the most
June 27, 2024 | The Guardian | Featured: Kristie L. Ebi View

How heat waves can kill...and how to stay safe
June 20, 2024 | Center for Science in the Public Interest | Featured: Kristie L. Ebi View

"Silent killer": US weather expert warns amid record-breaking temperature
June 20, 2024 | NDTV | Featured: Kristie L. Ebi View

This isn’t your grandparents’ summer heat
June 19, 2024 | Scientific American | Featured: Kristie L. Ebi View