The American Industrial Hygiene Association (AIHA) has announced the release of Heat Stress App 2.0, an enhanced mobile tool designed to protect indoor workers and employers from the dangers of occupational heat stress. This new version builds on the success of the original app, which primarily catered to outdoor workers, by incorporating specific risk factors unique to indoor environments. Lawrence D. Sloan, CEO of AIHA, highlighted the often overlooked risks of heat stress in indoor settings. "Heat stress risks for outdoor workers are more apparent due to intense sunlight and high temperatures, but indoor workers are equally vulnerable, particularly when there are localized heat sources like furnaces or ovens," he said. AIHA encourages indoor workers and their employers to use the new app to better understand and monitor these risks in real time. Heat Stress App 2.0 uses the Wet Bulb Globe Temperature (WBGT) index, a standard method for assessing heat stress, but adapts it for indoor use. Users can select from specific criteria about their indoor workplace, such as temperature, humidity, and the presence of heat sources. The app then translates this data into a corresponding heat stress risk level and provides tailored recommendations, including reminders for rest breaks and hydration. Additional features include fast-read guides on heat stress prevention, warning signs of heat-related illness, and acclimatization tips. Jo Anne Balanay, PhD, CIH, a professor of environmental and occupational health at East Carolina University and a longtime AIHA member, explained the key differences between indoor and outdoor heat stress. "Indoor workers facing heat stress from machinery and materials might benefit more from breaks in cooler areas, while outdoor workers might prefer shady spots and natural wind to cool down," she noted. Poor air circulation in indoor environments, which limits heat dissipation, can exacerbate these issues. Common indoor sources of heat stress include furnaces, ovens, boilers, and molten materials, making industries like foundries, commercial kitchens, and warehouses particularly high-risk. The updated app, developed by AIHA's Thermal Stress Working Group in partnership with East Carolina University, is available for free on both iOS and Android platforms and supports four languages: English, Spanish, French, and Portuguese. Its release coincides with 2024 being recorded as the hottest year globally, underscoring the increasing relevance of heat stress management. AIHA continues to offer comprehensive resources on its Healthier Workplaces webpage, which provides detailed information for both employees and employers. Employees can access personal risk factors, tools to assess fluid needs, and warning signs of heat-related illnesses, including exertional heat stroke. Employers can find strategies to implement evidence-based heat stress protocols to ensure the safety of workers in both indoor and outdoor settings. Founded in 1939, AIHA is dedicated to advancing occupational and environmental health and safety through its extensive network of experts and comprehensive educational programs. The organization serves as a crucial resource for professionals in public and private sectors, aiming to create safer, healthier workplaces and communities. Industry experts and professionals commend the timely release of Heat Stress App 2.0, recognizing its potential to significantly mitigate the risks of occupational heat stress. Dr. Balanay noted, "This new app fills a critical gap in heat stress management, providing a practical tool for both workers and employers to stay informed and take preventive actions. It aligns with AIHA's mission to enhance workplace safety and health, especially in environments where traditional cooling methods may be less effective." AIHA is known for its robust contributions to occupational health and safety, consistently delivering innovative solutions and educational resources to address evolving workplace challenges. The release of Heat Stress App 2.0 further solidifies its leadership and commitment to protecting workers from environmental risks.