Socioeconomic Inequality Drives Temperature-Related Mortality in Europe

Socioeconomic inequality is driving more than 100,000 additional deaths per year from extreme heat and cold across Europe, according to a study released May 8, 2026, by the Barcelona Institute for Global Health (ISGlobal).

The research analyzed more than 161 million deaths recorded between 2000 and 2019 across 32 European countries to quantify how social and economic disparities influence temperature-related mortality in both urban and rural populations. The findings indicate that regions with higher levels of social deprivation are consistently more vulnerable to both extreme heat and extreme cold.

According to the study, economic inequality is associated with approximately 177,000 deaths, while severe material and social deprivation account for roughly 157,000 deaths. The researchers identified several indicators of hardship that correlate with higher death tolls, including poverty and the inability to adequately heat a home.

The impact of energy poverty is particularly significant. The study estimated that more than 300,000 temperature-related deaths across Europe could be linked to households that are unable to maintain adequate heating.

In a statement regarding the risk factors, the Barcelona Institute for Global Health noted:

“Factors such as energy poverty, poorer housing conditions, reduced access to healthcare or lower health literacy may all contribute to increased risk,”

Barcelona Institute for Global Health (ISGlobal)

The study used different European regions as benchmarks to illustrate the potential impact of reducing inequality. Researchers found that if levels of inequality across the continent were reduced to match those of Slovenia, as measured by the Gini index, temperature-related mortality could be reduced by as much as 30%, which would equate to 109,866 fewer deaths.

The research also contrasted regions of extreme deprivation. Cutting severe material and social deprivation to the levels found in central Switzerland, the least deprived region in the study, would result in 59,000 fewer deaths from heat and cold. Conversely, if deprivation levels rose to match those of south-east Romania, the most deprived region, the result would be 101,000 more temperature-related deaths.

The Urban Heat Island Paradox

The study revealed a divergence in how wealth protects populations from different types of temperature extremes. Wealthier regions characterized by higher GDP per capita and longer life expectancy experienced lower mortality during cold periods.

However, these same affluent regions faced higher risks during heatwaves. This trend is attributed in part to the “urban heat island” effect common in densely built cities. This phenomenon occurs when urbanized areas experience higher temperatures because asphalt and other infrastructure absorb heat, combined with a lack of vegetation to provide cooling.

Climate Context and Future Risks

These findings emerge as Europe faces increasing temperature volatility. The EU’s Copernicus monitoring project ranked April 2026 as the third-hottest April on record globally. Some individual countries, including Spain, recorded their hottest April on record during that period.

Meteorological concerns have been heightened by the return of the natural heating phenomenon El Niño. Due to the potential for this cycle to be unusually strong, there are concerns regarding more brutal summer weather across Europe in 2026.

The ISGlobal research suggests that the burden of these climate events is not distributed evenly, with the most vulnerable populations bearing the highest cost of temperature extremes due to systemic socioeconomic disparities.