Heat-exposed workers, wearing air-conditioned jackets, which have cooling fans on their backs, are seen at the top of an apartment building under construction, as the Japanese government issued a heatstroke alert in Tokyo and other prefectures, in Tokyo, Japan, July 7, 2025. REUTERS/Issei Kato
TOKYO (Reuters) -Japan endured another day of a searing heatwave on Monday, with temperatures soaringto the highest this year in Tokyo and leaving those having to work outside vulnerable to the risk of heatstroke.
Heatstroke alerts were issued in 30 of Japan's 47 prefectures, the highest this year, after the country suffered its hottest June on record.
The extreme heat, which has become a norm in summertime Japan, has turned into a major workplace hazard, prompting the government to roll out labour safety regulations from last month requiring companies to implement protection measures against heatstroke.
Employers are now required to ensure employees wear clothing that allows air to pass through easily, to install a ceiling to block sunlight and to provide a break space with air-conditioning or shade.
At an apartment construction site in Tokyo, where temperatures exceeded 35 degrees Celsius (95 degrees Fahrenheit) for the first time this year on Monday, workers for Daito Trust Construction donned puffy air-conditioned jackets equipped with cooling fans on their backs while at work.
The custom-made jacket, which the company developed with a construction supplies manufacturer, uses thermoelectric effects to enhance cooling and has been distributed to 1,500 workers.
"When I wear this vest, I don't sweat as much, so I don't lose physical strength," said 47-year-old construction worker Atsushi Mizutani.
Construction workers are particularly at risk of heatstroke. They accounted for nearly 20% of deaths or illnesses caused by heatstroke in the workplace in 2023, labour ministry data showed. The overall number of heatstroke cases at work more than doubled that year from a decade ago.
"In the past, we didn't wear air-conditioned jackets or anything like that and there weren't as many cases of people collapsing (due to heat stroke) as there are now," said Takami Okamura, 57, who has been a construction worker for 34 years.
"In recent years, air-conditioned jumpers and other such items have become a necessity, which makes me realise just how hot it gets."
(Reporting by Irene Wang and Satoshi SugiyamaEditing by Gareth Jones)
