Heat stress and social dialogue in Spain

The study examines the role of collective bargaining in protecting workers from heat stress in Spain, a country that is particularly vulnerable to rising temperatures. Through an analysis of 596 collective sectoral bargaining agreements (CBAs) registered between 2020 and 2025, 14 heat action plans (HAPs), and 13 interviews with key actors, the integration of preventive measures into labor regulations is evaluated. Only 51 CBAs (8.6%) include preventive clauses that go beyond clothing measures and only 8 (1.3%) contained an adequate set of norms to address it in a more or less comprehensive manner. Company heat action plans, although more detailed and flexible, are highly heterogeneous and have limited coverage. Recent regulatory reforms in 2023 (RD-Law 4/2023) and 2024 (RD-Law 8/2024) require heat-specific measures and protocols for adverse weather events respectively, opening a window for strengthening prevention through sectoral and company agreements in the form of CBAs and HAPs. It is concluded that, despite some advanced examples, protection remains insufficient and uneven. The combination of a more precise legal framework, proactive collective bargaining and workers' participation regarding heat stress prevention is essential to avoid the exacerbation of health inequalities in an increasingly warmer climate, especially in sectors and companies with weak union presence.