The surging prevalence of exertional heat-related illness (EHRI) among sportspersons and military personnel, owing to the hot and humid conditions in summer in Japan, is fueling the adoption of heat stress monitors in the country. EHRI is defined as a range of heat-related illnesses that occur during exercise and sports activities performed under high ambient temperatures and humidity. Heat exertion stroke (EHS) is the most extreme type of EHRI. EHS is a critical heat-related illness caused by the overheating of the body, owing to prolonged exposure to extreme temperatures, and requires immediate medical attention.

Moreover, increasing advancements in wearable technology will accelerate the Japanese heat stress monitor market at a CAGR of 7.05% during 2021–2030. The market valued $1.98 million in 2020, and it will generate $3.96 million revenue by 2030. Compact, personal, and wearable heat stress monitors detect the physiological heat response of people from their bodies directly. These devices enable minute-by-minute data logging to enable close monitoring of personal heat stress levels.

Additionally, strict government regulations on heat stress management in manufacturing facilities and office spaces will fuel the adoption of heat stress monitors in the country. The Ministry of Health, Labour and Welfare (MHLW) of Japan has issued administrative instructions to prevent heat strokes. One of the administrative instructions named "Prevention of Heat Stroke in the Workplace" (Notice from the Director of the Labour Standards Bureau, MHLW, document number 0619001) mandates the measurement of the wet bulb globe temperature (WBGT) at workplaces.

At present, companies such as Teledyne FLIR LLC, TSI Incorporated, Nielsen-Kellerman Co., Fujitsu Ltd., Kyoto Electronics Manufacturing Co. Ltd., Sato Keiryoki Mfg. Co. Ltd., Keyance Corporation, Besantek Corporation, General Tools & Instruments LLC, and Sper Scientific Ltd. are manufacturing fixed and handheld/portable heat stress monitors in Japan. In the recent past, fixed heat stress monitors have been preferred over handheld/portable variants, due to their largescale adoption in manufacturing facilities of the country. Whereas, in the forthcoming years, handheld/portable variants will be adopted at the highest rate, due to the increasing number of workplaces and convenience offered by them.