ALCOA, Tenn. (WVLT) – Alcoa city officials ordered a shelter in place after an Ammonia chemical spill at US Foods. “The City of Alcoa Fire Department is asking all businesses in the Kings Court area and Hall Community residents to shelter in place and turn off your HVAC,” Alcoa officials said. “While the smell of Ammonia will not hurt you, we do not want residents and visitors breathing in too much of the chemical by circulating it into homes or businesses.”