Boston — For Arwa Ait-Chaib and her mother, Wafa El Hidar, summertime in Chelsea, Massachusetts, means trying to beat the heat. "There are always some days that I feel like we live in the middle of ...

"There are always some days that I feel like we live in the middle of the Sahara desert," Ait-Chaib said. Their Chelsea neighborhood, located just across the river from Boston, offers little shade.