 160 million Americans are under some kind of excessive heat alert this week as temperatures skyrocket across the country. A new proposed rule from the Occupational Safety and Health Administration could put some of the onus on employers to protect their employees from extreme heat. It would be the first major regulation focused on preventing heat-related deaths at work. What extreme heat means for the workplace, next time on 1A. That sounds good. 1A with Jen White, next at 10 a.m. here on NPR News.