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With high heat and humidity forecast across the region, public health officials warned residents not to leave pets or children in vehicles, as temperatures can escalate quickly and lead to heat stroke and death.

Two dogs left in a hot pickup truck in western Massachusetts died as a result of the heat Wednesday afternoon.

Erika Mueller, a co-owner of South Deerfield Emergency Veterinary Hospital, said the well-meaning dog owner left the animals in the truck with a window open and a supply of water, but the temperatures soared into the 90s, which can surpass 100 in a vehicle.

Bashir Saleh, a Times Square food vendor, glanced at a tiny thermometer Thursday morning and looked up with a wry grin: The temperature in his cart was pushing 100.

“I’m exhausted,” said Mr. Saleh, a native of Afghanistan who already had been working eight hours as the heat rose near his propane-gas-fueled coffee maker.

But it’s worth it to him, he said. He makes more money on the hottest days selling iced coffee and other drinks.

Sporting a visor with an American flag, Mr. Saleh, who fled the war in his native land, said that even when he’s sweating to earn a living, “I think, God bless America. For a few days, I can sacrifice.”

Contributing to this report were Associated Press writers Pat Eaton-Robb in Cromwell, Conn.; Jessica Gresko in Washington; Karen Matthews and Verena Dobnik in New York; Mark Pratt in Boston; Denise Lavoie in Quincy, Mass.; Erika Niedowski in Providence, R.I.; Kathy Matheson in Philadelphia; and David Porter in Newark, N.J.