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

Photo of floating houses in Peru made of wood and corrugated metal propped up on piers with floodwater underneath.

Planetary health projects win population health grants

Population Health Initiative pilot grants fund DEOHS collaborative research in Senegal and Peru

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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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In the news

1500 deaths in the recent European heatwave were due to climate change
July 9, 2025 | New Scientist | Featured: Kristie L. Ebi View

America’s coming smoke epidemic
June 27, 2025 | The Atlantic | Featured: Joan Casey View

How high humidity can affect your health—and when it gets dangerous
June 26, 2025 | Verywell Health | Featured: Tania M Busch Isaksen View

7 Tips for managing extreme heat
June 24, 2025 | The New York Times | Featured: Kristie L. Ebi View

What to do in a power outage
June 24, 2025 | Time | Featured: Joan Casey View