Workplace Heat Stress Affects Over 2.4 Billion Global Workers

Globally, over 2.4 billion workers face exposure to excessive heat in their jobs, resulting in an estimated 22.85 million occupational injuries each year. This significant heat stress can lead to the accumulation of heat in the body, potentially causing exhaustion, serious health issues, and in severe cases, fatalities.

Productivity losses are a direct consequence of high temperatures. Worker output decreases by 2–3% for every degree Celsius increase beyond 20°C in Wet-Bulb Globe Temperature (WBGT), a comprehensive measure of heat stress. Recent data indicates that approximately 30% of workers frequently exposed to high heat report a decline in labor productivity.

Health problems associated with workplace heat stress include hyperthermia, dizziness, impaired kidney function, dehydration, and neurological dysfunction. Severe outcomes can manifest as heat exhaustion or heat stroke, a life-threatening condition requiring emergency medical attention.

Certain groups are at higher risk, including older workers, individuals with chronic health conditions, and those performing physically demanding jobs, particularly outdoors. Migrant workers may also be more vulnerable due to less acclimatization and potentially less awareness of heat-related risks.

The World Health Organization (WHO) recommends the development of Occupational Heat Action Programmes. These initiatives should include tailored policies and advisories considering local weather patterns, job specifics, and worker vulnerabilities. Education and awareness campaigns for employers and employees on recognizing and managing heat stress are also crucial components.