Extreme temperature and mortality: evidence from China

Area of Science:

• Environmental Health
• Public Health
• Climate Science

Background:

• Extreme temperature events are increasing in frequency, intensity, and duration globally.
• These events pose significant health risks to human populations.
• Understanding the mortality impacts of extreme temperatures is crucial for public health planning.

Purpose of the Study:

• To estimate the short-term and long-term effects of extreme temperature on all-cause mortality in China.
• To identify which extreme weather indicators have the greatest impact on mortality.
• To assess the differential vulnerability of cities based on economic development levels.

Main Methods:

• Utilized a novel, nationwide dataset linking extreme temperature data with mortality records in China (2002-2013).
• Analyzed both immediate and sustained effects of extreme hot and cold weather on mortality rates.
• Compared the impact of various extreme weather indicators and socioeconomic factors on mortality.

Main Results:

• Both extreme heat and extreme cold exhibited significant short-term and long-term effects on all-cause mortality.
• Long-term mortality impacts from extreme temperatures were considerably higher than short-term impacts.
• Cold spell duration was identified as the most impactful extreme weather indicator on annual deaths per 100,000 people.
• Cities with lower economic development levels demonstrated greater vulnerability to extreme temperature events.

Conclusions:

• Extreme temperature events have profound short-term and long-term consequences on mortality in China.
• Cold spell duration is a critical factor driving temperature-related mortality.
• Economic development level is a key determinant of a city's vulnerability to extreme temperatures.
• Results underscore the need for region-specific extreme weather action plans in China.