To protect outdoor workers from extreme heat, Spanish municipalities are distributing smart wristbands that alert users to abnormal rises in body temperature. Cities including Barcelona, Motril, Getafe, Pozuelo de Alarcón, and Alcoi have adopted the initiative after a series of fatal incidents involving street cleaners and gardeners in soaring summer temperatures.
The need for these measures became clear after José Antonio González, a 60-year-old street cleaner, collapsed in Vallecas in July 2022 while working in 40-degree heat. His body temperature reached 41.6 degrees, and he died in hospital from heatstroke. Spanish summers have grown hotter since then, pushing local authorities to seek new ways to protect those most at risk.
Barcelona, with 1.7 million residents, was among the first cities to introduce a comprehensive protocol for urban service workers during heatwaves. Its guidelines require regular breaks and prohibit solitary work, while recommending lighter uniforms. Thermal wristbands were not initially mandatory, but unions pushed for their adoption. This summer, the city distributed 1,400 devices to gardeners, street cleaners, and civic agents, encouraging them to use them. The wristbands monitor temperature and pulse, then issue sound, light, and vibration alerts before a worker’s health is in danger. That gives workers time to rest, hydrate, or change tasks.
Motril, in Granada province, has equipped its street-cleaning staff with 25 smartwatches. They warn workers when body temperature exceeds 37.8 degrees or ambient temperatures reach 42 degrees. The protocol tells workers to stop, find shade, hydrate, and apply sun protection if necessary. They can return to work when the device signals safe conditions. Union representatives in Motril say the number of devices is insufficient for a workforce of more than 150, with older employees prioritized for the new system.
In Alcoi, the local council has acquired 30 wristbands for municipal teams in public works, environment, gardening, and electrical maintenance. These employees spend much of their day outdoors, leaving them particularly vulnerable to heat. Each device costs between 40 and 60 euros, weighs 30 grams, resists water and dust, and can run for up to five months without recharging. They include no GPS or data storage, protecting user privacy.
Pozuelo de Alarcón has also introduced the wristbands, particularly among employees of Grupo FCC, which manages street cleaning and waste collection with nearly 300 staff. Municipal sources say the devices are designed to warn workers before they feel unwell. In Parla, a pilot project launched in 2025 to monitor the critical signs of those most exposed to heat, with wristbands providing early warnings to prevent heatstroke.
Other municipalities, including Valdemoro and Alcalá de Henares, have begun equipping waste collection and green-space workers with the devices. Yet many areas in the Madrid region, including Arganda del Rey, Boadilla del Monte, and Majadahonda, have not adopted similar measures. Authorities in these towns focus on sharing official weather alerts and recommendations on social media.
Heat-alert wristbands are now reaching beyond municipal workers. The Junta de Extremadura has announced plans to buy the devices for its most exposed employees. The move comes as Spain faces a succession of heatwaves. The Ministry of Health reported 1,682 heat-related deaths nationwide between May and July 2026, up from 1,180 in the same period the previous year.
Regional health data show why protection must extend beyond outdoor crews. Navarra’s public-health reporting recorded 249 heat-associated illness cases during summer 2026, including 90 occupational cases: 52 among indoor workers, 35 in outdoor jobs, and three involving people driving. The report also recorded 21 hospital admissions and five heatstroke deaths, compared with a median of two such deaths over the previous eight years. Europa Press reported the figures from data provided by the Government of Navarra and the Navarre Health Service. They point to the need for workplace controls alongside wearable alerts, including work scheduling, shaded recovery, hydration, supervision, and medical response.
Each wristband uses a 74-decibel acoustic signal, a flashing red light, and vibration to tell users to stop, rest, and hydrate. When the risk subsides, the device switches to green, signaling that it is safe to return to work. The technology is considered a cost-effective way to reduce heatstroke risk for people who must work outdoors in extreme weather. It remains one part of prevention and cannot replace broader workplace measures.
A study by researchers from Imperial College London and the London School of Hygiene & Tropical Medicine, published in Nature and reported by Agencia SINC, shows the scale of the wider health risk. It estimated 6,824 heat-related deaths across 90 Spanish cities between June and August 2026, attributing 5,227, about 77 percent, to human-caused climate warming. The study described the summer as Spain’s hottest since records began in 1961, with an average temperature of 24.5°C and 61 days under heat-wave conditions. Its modeled estimates differ from Spain’s MoMo mortality-monitoring count, reported at 5,123 deaths for June to August. The two measures are not interchangeable.
Separate city-level research estimated more than 50,000 heat-related deaths during summer 2026 across 854 urban areas in 30 European countries. Roughly two-thirds were attributed to warming caused by fossil-fuel emissions. These population-level estimates do not count deaths caused specifically by occupational exposure. They show the broader context for municipalities expanding worker protections.
Spain’s increased focus on worker heat safety reflects a wider effort to adapt to climate risks. In other recent emergencies, including the Los Gallardos wildfire in Almería, authorities responded to deadly conditions affecting residents and emergency personnel. For more on how Spanish authorities have handled recent climate-related crises, see this report on the Los Gallardos fire response in Almería.
Heat-related illness remains a serious occupational hazard in Spain, especially for people in cleaning, gardening, and maintenance jobs. Smart wristband programs are spreading, but some regions still face coverage gaps and device shortages. Navarra’s figures also show that indoor workers and drivers face heat risks, reinforcing the need to pair alerts with practical exposure controls. As temperatures rise, the reach and effectiveness of these measures will remain under scrutiny.
