A delivery in Wilmington, N.C., this month. Heat is linked to hundreds of workplace deaths each year, but labor groups say the true toll is unknown because heat-related illnesses are not properly tracked or reported.

Chung Eui-sun, left, executive chairman of Hyundai Motor Group; Gov. Brian Kemp of Georgia, center; and José Muñoz, president and chief operating officer of Hyundai at the official groundbreaking for Hyundai’s plant in Ellabell, Ga., in 2022.