Last week, the city reached a deal with unions to restrict manual street cleaning work to below 39C.
With global average temperatures more than 1.1C warmer than the pre-Industrial era, Europe is being hit with more and more record-breaking hot spells.
Global heating will continue to make deadly heatwaves more frequent and intense with ever higher levels of atmospheric carbon pollution, scientists say.
The UN's climate science panel this year warned that tens of millions more people would be subjected to extreme heat days under 2C of warming; countries' climate plans have Earth on course to warm by 2.7C.
"Heatwaves can be fatal for people working unprotected from the sun, as we've already witnessed in Spain this summer," said Stahl.
The UN's climate science panel this year warned that tens of millions more people would be subjected to extreme heat days under 2C of warming; countries' climate plans have Earth on course to warm by 2.7C.
"Heatwaves can be fatal for people working unprotected from the sun, as we've already witnessed in Spain this summer," said Stahl.
"Workers are on the frontline of the climate crisis every day and they need protections to match the ever-increasing danger from extreme temperatures."