"Rivera is among the roughly 1.8 million people who work in U.S. warehouses where fast-paced physical tasks like loading boxes can raise body temperatures to dangerous levels that many climate-control systems struggle to counter, researchers, advocates and authorities say.

As e-commerce hastens a warehousing boom in some of the hottest parts of the country, regulations have lagged behind workplace heat risks that range from mild to deadly

https://www.nbcnews.com/investigations/warehouse-workers-extreme-heat-illness-osha-rcna95936