Ambient heat

Ambient heat has been studied in 2 papers since 2026: 1 observational study in people, 1 review; 2 in the past year. The newest story, Nov 6, 2026: “Long-term heat linked to higher death risk in California”.

Exposure

2 papers study itUpdated Oct 31, 2026

2 new papers in 30 daysSee all 2 papers on ambient heat

At a glance

The findings reach people, from one lab or study. 1 lab in 1 country.

“Overall mortality (n = 48,272 deaths) increased 5% (HR 1.05, CI 1.03-1.08) per 5°F increase in TMMX.”

Long-term ambient heat and overall mortality among California participants in the Multiethnic Cohort studyEnvironment international2026doi:10.1016/j.envint.2026.110580

None of its findings points the other way.

1 lab in 1 country

Funders: Division of Cancer Epidemiology and Genetics, National Cancer Institute and 4 more

Humans1

What is ambient heat linked with?

Studies link ambient heat with 3 measures, most often mortality due to heart diseases (1 study), mortality due to Alzheimer's disease and related dementia (1) and mortality (1).

Mortality due to heart diseases

upin humans1

1 study

Ambient heat is associated with mortality due to heart diseases in humans.
“TMMX was associated with increased mortality due to Alzheimer's disease and related dementia and heart diseases.”
Humans
Long-term heat linked to higher death risk in California
Environment internationalOct 27, 2026

Mortality due to Alzheimer's disease and related dementia

upin humans1

1 study

Ambient heat is associated with mortality due to Alzheimer's disease and related dementia in humans.
“TMMX was associated with increased mortality due to Alzheimer's disease and related dementia and heart diseases.”
Humans
Long-term heat linked to higher death risk in California
Environment internationalOct 27, 2026

Mortality

upin humans1HR 1.05

1 study

Ambient heat is associated with mortality in humans (California participants) (HR 1.05, 95% CI 1.03–1.08 per 5°F increase).
“Overall mortality (n = 48,272 deaths) increased 5% (HR 1.05, CI 1.03-1.08) per 5°F increase in TMMX.”
HumansCalifornia participantsPer 5°F increase in long-term average daily maximum temperatureUp to 25 yearsn = 88,283
Long-term heat linked to higher death risk in California
Environment internationalOct 27, 2026

Latest

2 papers in 12 months

Environment InternationalNov 6

Long-term heat linked to higher death risk in California

Each 5°F increase in long-term average daily maximum temperature was linked to a 5% higher relative risk of death among California cohort participants.Each 5°F increase in long-term average daily maximum temperature was linked to a 5% higher relative risk of death among California cohort participants.

Cohort · 88,283 peoplePopulations