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

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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Smoky skies over the Seattle skyline looking west to Olympic Mountains.

Climate change causing ‘indisputable’ harm to our health

5th National Climate Assessment authors include DEOHS climate experts

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Headshot of DEOHS Professor Kristie Ebi.

DEOHS Professor Kristie Ebi named 2023 AGU Fellow

American Geophysical Union recognizes Ebi for her work on health-related climate change impacts

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Joan Casey sits at a wood table outside on the UW campus with trees in the background.

Seeking sustainability and environmental justice

New DEOHS faculty member Joan Casey uses big data to analyze population-scale health problems and solutions

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In the news

Do hot summer temperatures weaken the immune system?
May 15, 2024 | Scientific American | Featured: Kristie L. Ebi View

New tools track worker-safe weather data
May 6, 2024 | Good Fruit Grower | Featured: Edward Kasner View

Power outages linked to heat and storms are rising, and low-income communities are most at risk, as a new NYC study shows
May 1, 2024 | The Conversation | Featured: Joan Casey View

New York cities plagued by blackouts due to climate change, study finds
May 1, 2024 | The Hill | Featured: Joan Casey View

New York power outage maps reveal severe weather threat
May 1, 2024 | Newsweek | Featured: Joan Casey View