Phoenix Fire Capt. John Prato demonstrates a new protocol that the fire department in America’s hottest big city is adopting as the West braces for the first heat wave of the summer season, Monday, June 3, 2024, in Phoenix. The cold water immersion therapy already used by hospitals in the area will also now be used by Phoenix fire and paramedics personnel on every patient they encounter this season with signs of heat stroke. (AP Photo/Anita Snow)
Phoenix Fire Capt. John Prato demonstrates a new protocol that the fire department in America’s hottest big city is adopting as the West braces for the first heat wave of the summer season, Monday, June 3, 2024, in Phoenix. The cold water immersion therapy already used by hospitals in the area will also now be used by Phoenix fire and paramedics personnel on every patient they encounter this season with signs of heat stroke. (AP Photo/Anita Snow)
Arizona Cardinals' Ben Stille cools down during an NFL football organized team activity, Wednesday, June 5, 2024, in Tempe, Ariz. (AP Photo/Matt York)
A person cools off in a mister along the Las Vegas Strip, Tuesday, June 4, 2024, in Las Vegas. Parts of California, Nevada and Arizona are expected to bake this week as the first heat wave of the season arrives with triple-digit temperatures. (AP Photo/John Locher)
Arizona Cardinals' Elijah Wilkinson cools off during an NFL football organized team activity, Wednesday, June 5, 2024, in Tempe, Ariz. (AP Photo/Matt York)
Hector Hernandez flings cups of water on Sharon, 9, and Cristian Roman, 8, at the public fountain along Prince Memorial Greenway in Santa Rosa, Calif., Tuesday, June 4, 2024 as a heat wave begins to bake the North Coast. The family of children an their parents cooled off in the fountain due to a lack of air conditioning at their homes. (Kent Porter/The Press Democrat via AP)
Arizona Cardinals' Zaven Collins wipes off sweat during an NFL football organized team activity, Wednesday, June 5, 2024, in Tempe, Ariz. (AP Photo/Matt York)
Dr. Paul Pugsley, medical director of the emergency department at Valleywise Health Medical Center in Phoenix, explains, Monday, June 3, 2024, how his staff will be working on a new protocol being adopted by the Phoenix Fire Department across its jurisdiction this summer in hopes of preventing some deaths from heat stroke. Known as cold water immersion therapy, the technique involves placing a patient with heat stroke inside a bag of ice slurry to bring down their body temperature long before the person arrives at a hospital emergency room. (AP Photo/Anita Snow)
People walk through cooling misters along the Las Vegas Strip, Tuesday, June 4, 2024, in Las Vegas. Parts of California, Nevada and Arizona are expected to bake this week as the first heat wave of the season arrives with triple-digit temperatures. (AP Photo/John Locher)