How to protect the people you care about from extreme heat

A woman cools off at a fountain at the Sforza Castle in Milan, Italy, on July 13. You can do a lot to look out for those who are at higher risk of heat-related illness. (Luca Bruno/AP)

Luca Bruno / Luca Bruno

All summer in Tokyo, Ms. Tsutsumi, a gray-ponytailed 73-year-old, has worried about getting sick from the heat.

“The other day it was so hot,” she recalls, “I went to a shrine and prayed, ‘Please let us survive this summer.'”

Like North America, Europe and other parts of Asia, Japan has been dealing with a scorching summer.