Workplace Medial Mystery: What is causing a recycling worker’s respiratory distress?

Joe worked at a metal recycling facility in Nevada. His typical job duties included operating a material handler to load scrap metal into a shear for crushing. During his shift at the recycling facility, Joe looked up to see a plume of thick yellow smoke swirl around a pile of scrap metal and was suddenly overcome with shortness of breath, coughing, chest pressure, and eye irritation. He thought about grabbing a fire extinguisher but then ran away from the smoke until the air cleared. Joe’s supervisor saw that he was in distress and called 9-1-1. When medical help arrived, Joe’s