London Mayor Sadiq Khan is backing growing demands for a maximum UK workplace temperature, as repeated climate crisis-driven heatwaves disrupt schools, hospitals, and transport infrastructure across the capital.
Campaigners and trade unions are urging the British government to establish legally enforceable indoor heat limits.
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They point to a June heatwave that claimed approximately 440 lives daily during its peak three-day period.
While the United Kingdom currently enforces statutory minimum workplace temperatures, no upper legal limit exists to protect workers from extreme summer heatwaves that have pushed some indoor work environments above 40C.
The Trades Union Congress and Unison are demanding a maximum indoor working limit of 30C, which would drop to 27C for employees performing strenuous physical labor.
Support for the policy grew over the weekend when Green Party Member of Parliament Hannah Spencer announced plans to introduce a parliamentary bill establishing a formal workplace heat limit.
A spokesperson representing the London Mayor confirmed Khan's endorsement of the safety limit, noting that extreme heat is increasingly affecting residents in the capital.
The spokesperson explained that while the mayor lacks the legislative power to enforce a maximum temperature, he supports the policy to help London adapt to severe heatwaves.
Green Party Mayor of Hackney Zoë Garbett also urged the government to act, framing the heatwave protections as a vital issue of social equity for local families and workers.
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