I wonder if the opposite is true? In my region low income people work seasonally in fish plants. Although now many fish plants hire people from outside the coun

I wonder if the opposite is true? In my region low income people work seasonally in fish plants. Although now many fish plants hire people from outside the country because they can pay them less. The fish plants are wet and very cold the workers wear rubber gloves and often have their hands in ice. If 30C is the heat stress threshold is there a cold stress threshold?