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 yellow sign reading "water over roadway" is reflected in floodwaters.

An urgent call to action on climate change

UW authors in new IPCC report emphasize the accelerating threats to human health and well-being

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A farmworker with his back to the camera carries a bunch of bananas on his back, with a grove of trees in the background.

What's silvopasture, and how can it help workers in the tropics?

Planting trees in pastureland provides significant cooling in the tropics, new UW-led study finds

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Three-part image including photos of a woman holding an air pollution monitor outside, two people in masks and face shields in a lab holding water samples, and firefighters fighting a wildfire.

Our most-read stories of 2021

Collaboration, community health and clean air: counting down our top 10 blog posts of 2021

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Two kids bike and one kid walks through flood water with a yellow shuttered building in the background.

Climate change sounds ‘code red’ for health

Climate crisis gravely threatens human health, according to new Lancet Countdown report coauthored by DEOHS researchers

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lady working in the tropics

Deforestation's toll on outdoor workers

Deforestation and climate change linked to more worker deaths and unsafe conditions, according to new study co-authored by DEOHS researchers

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Kids cool off in a sprinkler on a hot day at a park as adults look on.

Responding to the health risks of heat waves

DEOHS researchers analyze public health impacts of climate change in light of this summer’s extreme heat

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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