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

Cordy stands in front of greenery and smiles at the camera. Cordy wears a black shirt, silver necklace and silver earrings.

Clarifying climate health risks and solutions

UW School of Public Health undergrad interns with Center for Health and the Global Environment 

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Person in a sweatshirt picking apples

Protecting crop workers under the sun and smoke

DEOHS research in agriculture industry aims to increase worker health and safety in heat and wildfire smoke

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Mike Yost stands at a lectern, facing a crowd (not visible). He wears a dark jacket and purple tie. In the background is a tall banner.

Leading with community as a North Star

DEOHS Chair Michael Yost steps down after 10 years 

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Hannah McKinley smiles in front of a bush on the UW campus.

From the ‘COVID years’ to belonging

Hannah McKinley named 2024 DEOHS Outstanding Undergraduate Student

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Close-up on youth marching for climate action, with a sign with text "There is No Planet B" and a drawing of the Earth with bright lines surrounding it.

Centering young “climate heroes”

DEOHS-led project takes a collaborative approach to assessing extreme heat health risks in youth BIPOC communities

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Kids playing in a fountain

Our top stories of 2023

The year of community resilience: Counting down our most-read stories of 2023

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In the news

The climate crisis is endangering workers
August 19, 2025 | Think Landscape | Featured: Kristie L. Ebi View

We knew increasing heat was bad for our health. A new study reveals how much.
August 1, 2025 | The Weather Channel | Featured: Kristie L. Ebi View

Hotter summers could be making us sicker in unexpected ways
July 30, 2025 | Washington Post | Featured: Kristie L. Ebi View

Federal cuts put Washington workplace safety research at risk
July 29, 2025 | Cascade PBS | Featured: Marissa Baker, Elena Austin View

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