Mexico’s Health Ministry says at least 112 people have died in the past two weeks as an unprecedented heat wave drove temperatures as high as 50 degrees Celsius, or more than 120 degrees Fahrenheit. Residents of Monterrey say they’ve been forced to limit their time outdoors.

Marco: “I work in construction, and it’s really bad. We hydrate with water and rest for 15 minutes, and then we go back to work again. We do that every hour.”

Stifling heat and humidity are continuing across Texas and southeastern states, where officials say extreme temperatures have killed at least 14 people. Farther north, more than 100 million people are under air quality alerts again today as thick smoke from Canadian wildfires drifts east. Detroit, Washington, D.C., and New York City ranked among the six worst cities in the world for air quality this morning, though forecasters predict some relief from hazardous air over the July 4th holiday weekend.