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

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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A person harvests plants in a field exposed to direct sun with mountains and trees in the background.

Deforestation threatens worker health and productivity

Heat limits worker productivity in tropical deforested areas, according to new study from DEOHS, The Nature Conservancy and others

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3 people wearing face masks stand next to weather monitoring equipment inside a chain-link fence.

Heat, fire, smoke and health in Washington’s ag industry

DEOHS researchers investigate the combined health effects of wildfire smoke and heat on Washington’s agricultural workforce and test strategies to protect workers and crops

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A wilting sunflower surrounded by dried out plants.

A hotter future could be deadly for many

US deaths due to heat exposure may markedly increase in a warming climate, according to research from DEOHS and collaborators

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A group of people kneeling or leaning over green shrubs in the sun.

Heat risk for farmworkers

US agricultural workers will see unsafely hot workdays double by 2050, says new UW, Stanford study

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In the news

In a hotter world, some people age faster, researchers find
August 25, 2025 | The New York Times | Featured: Kristie L. Ebi View

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