More than 100,000 people were sent to hospitals due to heatstroke in Japan between May 1 and Sunday, according to preliminary data from the Fire and Disaster Management Agency.

The number is the most on record, according to NHK. Transport to hospitals of patients linked to heatstroke over the period rose almost 3% to 100,143 from a year earlier as Japan saw its national temperature record broken twice in a matter of days. The country’s average temperature during this summer was the highest since the statistic began being compiled in 1898, the nation’s weather agency said last month.

Heat waves around the world are being made stronger and more deadly due to human-caused climate change.

Government officials in August pledged to boost public health protections and encouraged the installation of more air conditioners in school gymnasiums and the use of cooling centers in communal spaces like libraries. New rules came into effect this summer that require employers to take adequate measures to protect workers from extreme temperatures.

Heatstroke is a potentially life-threatening condition caused by a dangerously high body temperature that can result in severe organ damage if not treated quickly. There were almost half a million heat-related deaths annually between 2000 and 2019, according to a report last year by the World Health Organization.