Belgian heatwave linked to record 1,747 excess deaths, Sciensano reports
Belgian heatwave caused a record 1,747 excess deaths from June 18 to July 1, Sciensano says; authorities warn of another multi-day heat spell and ozone risk.
Belgian health authorities reported a sharp rise in fatalities tied to the late June Belgian heatwave, with 1,747 excess deaths recorded between June 18 and July 1 compared with expected mortality. The Institute of Public Health, Sciensano, said this represents a 47.8 percent increase in deaths for that period and marks the highest toll during a heatwave since national records began in 2000. Preliminary counts issued earlier had indicated 1,222 excess deaths for the shorter window of June 18–29, but updated totals and extended reporting raised the final figure. Officials warned that the severe mix of prolonged high temperatures and elevated ozone levels amplified the health impact.
Excess deaths recorded between June 18 and July 1
Sciensano calculated 1,747 excess deaths in the 14-day span from June 18 to July 1, compared with the number of deaths normally expected during that period. The institute characterised the figure as unprecedented for a heatwave in Belgium since systematic records began in 2000. That surge reflects deaths directly and indirectly linked to extreme heat, including cardiovascular, respiratory and other heat-exacerbated conditions. Public health analysts noted reporting lags and data consolidation as reasons the toll rose from earlier preliminary estimates.
Sciensano links fatalities to duration intensity and ozone
In its statement Sciensano attributed the exceptional mortality to a combination of three aggravating factors: the unusually long duration of the heat event, the severity of daytime and nighttime temperatures, and high concentrations of ground-level ozone. Each factor on its own raises health risks, the institute said, and their concurrence produced particularly hazardous conditions. High nighttime temperatures reduce physiological recovery, while elevated ozone worsens respiratory illness and can increase emergency admissions. Sciensano stressed that the synergy of these elements made this episode more lethal than previous heatwaves.
Revised totals outpace earlier preliminary figures
Initial, preliminary numbers published last week had shown 1,222 excess deaths for the period from June 18 to June 29, but later consolidation of mortality data and inclusion of days through July 1 produced the higher final total. Health statisticians explained that weekly mortality surveillance often requires additional days to capture late reports and to correct provisional records. The updated methodology did not alter the period under review but extended the final day to July 1, accounting for further heat-related fatalities. Analysts emphasised the importance of using consolidated figures when assessing the public-health burden of extreme weather events.
Forecasters warn of a fresh heat spell in early July
Meteorological services warned that the country could face another significant heat spell in the days following July 1, with forecasts indicating daily highs above 30°C persisting for several consecutive days. Forecasters also cautioned that high temperatures combined with stagnant air conditions would likely elevate ozone formation, compounding respiratory risks. Authorities urged residents to monitor local forecasts and air quality alerts as the situation evolved. Emergency planners said the possibility of back-to-back heat events increases pressure on hospitals, care homes and emergency services.
Health impact concentrated among older and vulnerable populations
Public-health experts highlighted that the elderly, people with chronic heart or lung disease, young children and those working outdoors bore the brunt of the heatwave’s toll. Vulnerable individuals are less able to thermoregulate and often face barriers to accessing cool environments or adequate hydration. Care facilities and hospitals reported spikes in heat-related admissions, and clinicians emphasised the role of nighttime cooling in reducing mortality. Sciensano and health services urged caregivers and community organisations to prioritise checks on at-risk people during heat spells.
Calls for preparedness and public protection measures
In response to the mortality figures, Sciensano and local authorities reiterated standard heat-health guidance including staying hydrated, avoiding strenuous outdoor activity during the hottest hours, using cooled or shaded spaces and checking on neighbours. Air-quality advisories were also issued where ozone concentrations were high, with recommendations for people with respiratory conditions to limit exposure. Municipalities activated or expanded cooling centres and public awareness campaigns, and employers were encouraged to adjust outdoor work schedules. Health officials said proactive preparedness remains the most effective tool to reduce avoidable deaths during extreme heat.
Belgium’s record excess deaths during the late June heatwave underscore the mounting public-health challenge posed by extreme temperature events, and officials have urged sustained vigilance as forecasts indicate continued hot, ozone-prone conditions. Communities, health services and individuals are being called on to follow guidance closely to protect the most vulnerable in the days ahead.